Facebook Group Add Admin
Step 1. Sign in to the Facebook account on which you are an administrator for the group concerned.
Action 2. Browse to the Facebook group and after that click the "See All" web link in the Members area on the appropriate side of the page. This shows a listing of all the current group participants.
Step 3. Click "Remove Admin" next to the name of any kind of group admin whom you want to Remove. Click "Okay" in the tiny home window that opens to confirm that you wish to remove he or she as an admin.
Step 4. Click "Make Admin" beside the name of any type of group member whom you wish to make into an admin for the group. Click "Make Admin" in the tiny home window that available to verify this choice.