To add a feature-rich chat room to your MyBB, please refer to the following instructions.

Firstly, please download MyBB chat module, and uncompress the package.

Then copy files:
1. Copy: folder 123flashchat/
To: <MyBB installed directory>/123flashchat/

2. Copy: /images/toplinks/icon_123flash_chat.gif
To: <MyBB installed directory>/images/toplinks/icon_123flash_chat.gif

Secondly, edit files.
1. Login your website admin panel->Templates & Style -> Templates->Manage Template Sets->Default Templates->Header Templates->header.

Find
<ul>

After add

<script language="javascript" src="{$mybb->settings['bburl']}/123flashchat/chatwinsize.php"></script>
<li><a href="javascript:openChat();"><img src="{$mybb->settings['bburl']}/{$theme['imgdir']}/toplinks/icon_123flash_chat.gif" alt="" title="" />Chat</a></li>

2. Login your website admin pane ->Templates & Style -> Templates->Manage Template Sets->Default Templates->Index Page Templates->index_stats

Then please copy the following code, and paste them in the end.

<tr><td class="tcat"><span
class="smalltext"><strong>Chat</strong></span></td></tr>
<tr>
<td class="trow1">
<span class="smalltext">
{$chat_info['connections']}
{$chat_info['logon_users']}
{$chat_info['room_numbers']}
{$chat_list}
</span>
</td>
</tr>

3. Please open <MyBB installed directory>/index.php

Find:
$lang->load("index");

After Add:

// begin 123 flash chat mod include
require_once MYBB_ROOT."123flashchat/functions_chat.php";

$chat_info = getChatters();
$chat_list = getChatterList();
if ( $running_mode != 3){
$chat_info['room_numbers'] = 'There are <b>'.$chat_info['room_numbers'].'</b> rooms<br>';
$chat_info['connections']= 'There are <b>'.$chat_info ['connections'].' </b> connections<br>';
}
$chat_info['logon_users']= 'There are <b>'.$chat_info['logon_users'].' </b> logon users<br>';
$chat_list = 'User list: <b>'.$chat_list.' </b> <br><br><a href="javascript:openChat();">Click here to start chatting</a>';
//end 123 flash chat mod >

Thirdly, configure MyBB chat module's running mode.
Please choose the running mode according to your need, and the configuration path is
<MyBB installed directory>/123flashchat/flashchatconf/config.php.

Then configure the following parameters:
$running_mode

Configuration reference:
$running_mode = 1; (only 1 or 2 or 3)

1. Chat server is hosted by your own ($running_mode = 1).
If your chat is hosted by your own, 123FlashChat server software should be installed at first, please download 123FlashChat.

Configuration path:
<MyBB installed directory>/123flashchat/flashchatconf/config_local.php

Configure the following parameters:
$chat_group = "default";
$client_size_width = 634;
$client_size_height = 476;
$chat_data_path = "<123flashchat installed directory>/server/data/default/";
$primary_server_host = "localhost";
$primary_server_port = 51127;
$chat_client_root_path = “http://localhost/client”;
$swf_file_name = "123flashchat.swf";

2. Chat server is hosted by 123flashchat.com ($running_mode = 2).
If your chat is hosted by 123Flashchat.com, no 123FlashChat server software is needed to be installed; you may connect to your host chat room directly.

Configuration path:
<MyBB installed directory>/123flashchat/flashchatconf/config_host.php

Configure the following parameters:
$client_size_width = 634;
$client_size_height = 476;
$client_location = "http://host*.123flashchat.com/hostname/";

3. Chat server is hosted by 123flashchat.com free of charge ($running_mode = 3).
If you prefer free hosting, then you don't have to install 123 Flash Chat server software, we take care the hosting and all you need to do is just pick a room name you want.

Configuration path:
<MyBB installed directory>/123flashchat/flashchatconf /config_free.php

Configure the following parameters:
$room_name = "YourRoomName";

(If you leave $room_name as blank, the default $room_name's value will be your domain's name.)
$client_size_width = 634;
$client_size_height = 476;

Fourthly, integrate your chat with MyBB user database, after doing that, users can auto-login your MyBB chat, it means they won't have to enter their accounts again.If you choose running mode (1) or mode (2), you need to set Auth-URL by following the instructions below.

1. Log in the Chat Admin Panel.

2. Server Settings -> Integration ->DataBase -> SELECT: URL -> edit.

3. Change URL to
http://<MyBB installed directory>/123flashchat/login_chat.php?username=%username%&password=%password%

4. Press OK to save your setting.

5. Restart chat server at Server Management -> Restart.

The following image describes how auth-URL integration works.

The Auth-URL application will perform as the communicating medium of the chat server and the database, i.e.: in fact, when a user logs on a chat server, the server won't connect to the user database directly, instead, it will send the username and password to the Auth- URL. Then the Auth- URL requests the database to authenticate the user. Finally, the Auth- URL will return the feedback to the chat server in a predefined way, whether approved or declined.

Integration done, enjoy your chat.

If you have any questions about chat room, please visit http://www.123flashchat.com/faq.html.
You can also send email to support@123flashchat.com, we offer free integration service for license buyer and yearly hosting buyer.