Yes of course you type it in at the bottom.
And i'll give you a low down on the commands:
Since your name is Rich 'll use that for your name:
To change your nick name type this is and press enter: /nick 'Rich'
To show emotions during chat type this in and press enter: /me 'is feeling sad'
To show that you are away type this in and press enter: /away [im having dinner]
To exit you can type this and press enter: /quit [i have to go to a party]
They are the most common, but there are more, and there are alot more for the mods to remember.
Anyways hope this helps