Multi-stream commands to show the link get annoying if you keep entering in the username afterwards. Here are two commands to make your lives a little easier. One command for users to get the link and a command for moderators to change the user.
Command for Users:
!commands add !multi Current Link: http://multitwitch.tv/
Command for Moderators:
!commands add !multiset -ul=moderator -a=!commands edit !multi Current Multi-Stream Link: http://multitwitch.tv/$(channel)/$(query)
When you need to change the multi-stream link just follow the example:
!multiset Kappa
and the !multi command will update to respond with:
Current Multi-Stream Link: http://multitwitch.tv/aaron128l/Kappa
This supports all types of different multi-stream services. Just be sure to edit the !multiset command and put the $(query) in the right place of the link. Enjoy.