On the site members page (http://adultmembersites.com/app/#/members-active), click add free member button:

Search for member: If you feel that the member may already exist in the system, first search. 

If the user is not in the system, create a new user by entering their username and email:

Select a free membership length & click "CREATE FREE MEMBERSHIP:

The member will receive one of two auto emails based on whether or not they are already in the system or not:

These auto emails can be customized here: http://adultmembersites.com/app/#/auto-emails  

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