There are basically two main ways of Aoping (Aopping?) people for your channel.
1) Requires a client that will act as a bot in the channel and will be there all of the time.
For this option, read up on /help /aop
Reply if you want to use this option and are still having difficulties.
2) Requires a channel service (usually called chanserv), which is running on the network.
For this option, try /msg chanserv help aop
If that doesn't work, check with the local help channel (usually #help) and make further enquiries there.