To connect to a server, select the File->Connect->Casual option. A dialog box will appear which contains;
Connect to
Port
Callsign
Channel
Nickname
Type in the Hostname or IP address of the converse server.
Type in the port that the server sits on. Defaults to 3600.
Type in your callsign without SSID or nickname.
Type in the number of the channel where you want to start.
Type in a nickname by which you would like to be called. (perhaps your first name)