Before your members can login to Pianola you need to send them an 'invite email'. There are three ways to do this:
Invite an individual member
Go to the Admin > Members area and search for the member you wish to invite.
Click on the link that says 'Send [member's name] an invite email'.
Invite a group of members
First, create a 'Simple Group' (click here to learn how). Then go to Admin > Members > Invites.
Select the group you want to invite and click 'Invite selected groups'.
Invite all your members
Go to Admin > Members > Invites
Click the 'Invite everyone' button. This will send an invite email to all your members (who have an email address) that have not already setup a Pianola account.