Admin logon

For the new freetoasthost 4.0, how can we make it so that the administrator access can be accessible by 3 people instead of only 1 person. Currently our website has just been upgraded to the newer version of freetoasthost 4.0, but now I cannot log on anymore using the old admin user name and password. It only sticks with one personal email of the person who used to be the "admin" in our old website. He is one of our administrators, but I want to be able to have at least 3 people who can manage the website instead of only one person. Now no one has access to admin part of the website other than one individual. How can we make that change so that we can log on as long as we have the user name and password, like the old freetoasthost 3.0? We just don't want to count on only one person being the admin and if he doesn't know how to update certain page, then no one else has the authority, esp as the admin is under his individual email and obviously he cannot share his own logon password with other members. Is there a way around it to put more than one person as admin on freetoasthost 4.0?