Thread:SDMarukokun/@comment-27862737-20160714192017/@comment-4199297-20160714194648

Go to someone's profile -> contributions tab -> there should be a "user rights management" among that header of links. Not 100% sure if an admin can add/remove up to admin or only the groups that are below admin. One of the other options at that header is "block", which can be used to block vandals/spammers/etc. from further editing. (a few days block is usually enough for them either to stop doing it or never return; perma-blocks are mostly not really needed)