Customer Portal

My agency has multiple applications that team members need to access. How do they get access to all six at the same time as opposed to having to enter multiple portals separately? We have granted them permission to use all applications and sent out email invites. Now each of them has several usernames and have been required to set passwords for each portal. Most of them don't work and now everyone's confused yet few people have access. How best to proceed with this? Also, we have deleted some applications and would like those portals to be deleted. How do we delete these so that they don't show up on the customer portal page?

Thanks, Cynthia