Are there chat RPs here? How do I learn about them?
There are existing roleplay chat rooms, but you can also make your own rooms. Creating a chat room is easily done by going to the Chat area of the site, clicking the Add Room button on the upper right, and filling in the necessary details. Be sure to set a password if you wish to make it a private roleplay, but know that all site rules still apply in chats and staff members can check your chat logs even if you do use a password.
To learn more about how to chat roleplay, read this workshop (but be aware that it was written in 2011 so some of the terminology and such is outdated).