You can set a Usergroup to be a Public Joinable Usergroup (Public (Joinable) Custom Usergroups = Yes).
Public Joinable Usergroups can be selected by a member in their UserCP. they can join and leave these usergroups as they wish.
If you also assign one or more Usergroup Leaders (Add Usergroup Leader from dropdown menu after creating the group), then all join requests must be aproved before the member is added to the usergroup.
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