To chat, simply type a message into the chat buffer at the bottom of the window, and press enter.
You can include dice rolls in your chat messages using a square brackets notation that looks like this: [dice] where dice is the number of dice you want to roll. Note that the roller is configured for Exalted, and assumes you want to roll some number of d10s for everything.
You can specify additional parameters for your roll by including them in the square brackets. Each optional parameter is denoted by a one letter shorthand, followed by the numeric value of the parameter:
So for example you could send [10t6+2x2] to roll ten dice, counting a sucess on six or higher (and two successes on a 10, by default), adding two bonus successes, multiplying the total by two, and comparing that against no particular difficulty.
You can freely intermix any number of rolls with regular chat text.
Additionally, a variety of commands can be entered in chat by preceeding the appropriate keyword with a slash (/):
Unrecognized commands will be ignored, but you don't need to type out the full name of the command - the system will do its best to match your command with one of the entries above.
For convenience, you can use the up and down arrow keys to navigate through the messages you've sent and send them again, allowing you to quickly and easily repeate the same command.
Note that your message history will be preserved on your computer as long as you're using the same browser. If you change devices, change browsers, or play in Incognito mode, it won't be remembered.
Various options can be configured in the options menu.
To create or access a room, simply go to https://instanttabletop.com/room-name, where room-name is the name of the room you want to make, including only letters, numbers, underscores, and dashes (other characters will be ignored by the system).
Your room will be automatically created by the system, if space is available. If not, you'll be queue for the next available space.
All rooms are public and accessible at the address that created them, so the room can be accessed by other players by navigating to that same address.