We are talking about this setting:
admincp => vbgallery => usergroup permissions => (a usergroup is selected) => general options => Can change profile block settings (yes/no).
If set to yes, Luciano explains in post 3 how the users can actually in practice change the settings. And yes, this is built into vbgallery, and is not a
vb forum thing, nor an vbulletin.org thing, but indeed a vbgallery thing.