Well, the way it works on SnapBraggin, you must be the Host of a Gallery in order to send invitations !

Only the Hosts (managers) of SnapBraggin Galleries have the ability to invite new members to join their Gallery memberships. 

So, if you'd like to invite your friends, you will need to:

acquire a Hosting Plan (free or paid), create a Gallery, and become a Gallery Host.

Once you are a Gallery Host, you will have the excitement of being able to send out your own invitations!