In the servers tab you can add/edit/remove hostnames and ports which this network should connect to.
AdiIRC will try each hostname in order from top to bottom.
Opens up the add server dialog.
Opens up the edit server dialog.
Removes the selected server(s) from the servers tab.
Moves the selected server(s) higher up in the serverlist.
Moves the selected server(s) lower down in the serverlist.