Also you can use this

https://itunes.apple.com/app/irchon-chat-with-other-users/id300838089?mt=8

I know one. I use it for my ipod it is called ""turboIRC" ( http://www.appannie.com/app/ios/turboirc/ )
It is free and easy to use.
Just open the app and click "connect"
After you did that you see 8 options.
Tap on "Server" then press edit.
Change the adress to "irc.tl"
After that you can join #ygirc easily.