They follow the proper step and can not get in. I provided them with the access code. Can you provide a procedure to log in for a member we have sent an Invitation? Also to the administrator for future requests what to do. Thank you.

Your website is setup as a membership site. That means you invite family members to your site from the Invitations page under Tools in the menu. Then TribalPages sends them an email inviting them to setup their own passwords. They login to your site with their email and password.