Firs you heve to register his nick and your channel, then give it access to chanserv on it and then msg nickserv and chanserv the identify lines. Btw, look in the TCL Archive for an tcl that is doing this.
Log on to your irc net with the nickname of your bot and register it to chanserv.
services.tcl is a good script to identify your bot to nickserv. Got to the tcl Archive and search for services, there you can find a few fine working scripts.