I figured out how to do this. You have to be the creator of the group. Go to the GROUP page, not the clan page, and go to admin tools. You scroll down to where you can activate it as a PSN or XBL clan, and there is a field there for tags.
English
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Hey everyone, I just created a clan and I'm recruiting. If your 420 friendly join the Galaxy Stoners ... Psn Smoke-Ghanja-420