Why do I appear to be the admin of the group?

You're not THE admin of the group, you're AN admin of the group. 

Apparently Artfizz chose his 12 disciples to help lead the rest of the flock, and we are among them.  It is actually good to have a team of trusted administrators to keep everything running smoothly.

Enjoy your powers, but don't abuse them. 

12 disciples, I hope no-one turns out to be Judas

 I actually don't plan to do anything drastic.

It's the UNPLANNED drastic actions that keep me awake at night.

With such a trusty band of lieutenants, it's nearly time for me to ride off into the sunset.