On the right you'll see a category for Group Matches - click that then find "Start a Match" - (may be worded differently) There you can fill in the challenge details.
Let's challenge the Red Sox Fans
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I can't get by the "groups I manage." May be one of our founders needs to issue the challenge. We should definitely go after those guys ... after all the Yanks rule!
Anybody know how we challenge those guys?