You go to a person in the group you want's profile and click on groups and join them.
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Joining Roblox is free but you have to pay if you want to upgrade to Builders club in order to make groups, get robux, join more groups etc.
Go on someones profile on ROBLOX (Anyone who has a group.) Then go to the part of their profile page that says Groups. Click on one of the groups. Then you'll see something that says Search Groups, and in that put something your interested in and pick a group and then either say Join Group or Request to Join Group.
The millionth player on roblox is 2COOLFORU.
ROBLOX AND BUILDER MAN
you just search the group name in the search bar and you can join. But, you can only be in 5 groups at a time if you are not BC