Put the following code(s) in your "remotes" (or type ALT+R)

Code:
  
on 1:join:[color:red]#Channel[/color]: { mode $chan +v $nick }


or if the channel is registered with ChanServ you could do this

Code:
 
on 1:join:[color:red]#Channel[/color]: { msg ChanServ Voice $chan $nick }


But ChanServ also has a feature (depending if your network supports it or not) called the VOP command. To add someone to this list, type:

/msg ChanServ vop Channelname add Nickname

For additional help with this command, type: /ChanServ help VOP (usually thats what it is) or go to your designated Network help channel.

***NOTE: The text in red indicate where you put YOUR channel's name

Hope this helps