First you need to download the [MyBB 1.8 module](https://github.com/bensmiley/Chatcat/tree/master/MyBB/MyBB%201.x) from our Github page.
## Uploading the files
Then you need to add the module's files to your MyBB site. Add the files **CCAuth.php** and **ajaxchat.php** to the root of your MyBB installation.
![File structure](http://img.chatcatapp.com/mybb18_img_1.png "Adding Chatcat to MyBB")
## Activation and configuration
Admin Control Panel >> Configuration >> Plugins
And activate Chatcat.
![Activating Chatcat](http://img.chatcatapp.com/mybb18_img_2.png "Activating Chatcat")
Admin Control Panel >> Configuration >> Settings >> Chatcat
![Chatcat settings](http://img.chatcatapp.com/mybb18_img_2.png "Chatcat settings")
Then open the settings:
![Chatcat settings](http://img.chatcatapp.com/mybb18_img_4.png "Chatcat settings")
If you leave the API key blank, then the chat will use the default login system. By entering the API key you activate single sign on and Chatcat will integrate with the MyBB login system. You can find your API key and secret on the manage site section of the dashboard.
If you want to add custom login and sign up pages to the Chatcat popup, you can enter the addresses in the fields.
For a full explanation of the Primary URL field, you can visit the configuration page.