Shared Passwords Group -- how to access

When I make a Shared Password Group, how do the invitees access the Group? I.e. Does every invitee use the same password as the owner, or does each person then have their own password to access the group? Reason I'm asking is none of the literature on the subject mentions how group members access the group, and I would not want to give all invitees access to ALL my passwords. I have a master password/passkey to access all my passwords. If I make a group, do I give it another password? Or do the individuals use their own master passwords to their own password apps to access? Thanks.