If you're a member of a club that uses GroupValet, you can search for other groups to join. Log in to groupvalet.com and near the upper right click the drop-down that says "Search for a Group or Club to Join" to look for the groups at your club. Be sure to click the Search button to begin the search. You'll be able to join groups directly from the page of results.
In our app, tap the 3 lines in the upper right and choose Search for Groups.