The Open Connection button brings up the sign-on dialog. There you should enter the name or IP number of the machine you would like to connect to, the name of your account (i.e. the user id), and that account's password. If the account name is omitted the name “anonymous” will be assumed. If the password is omitted the default password “Fetch@dartmouth.edu” will be used.
You can fill in some or all of these fields by choosing an item from the Shortcut pop-up menu. Click on the icon at the bottom of the sign-on dialog and the menu will pop-up. It includes the names of several Internet archives.