If you would like to connect to several IRC servers at once, you should be able to return to this page, change the fields approprately, then press "Connect" again for a new window. Connecting to the same server and channel twice, however, or with the same nickname, will probably not work, and you will find that one or the other of the offending windows will not function well.
To exit, the normal "/quit" command should work and close the current window.