All of Eicra’s web application has built-in permission system which was based on ACL architecture, so you can set permission for role (group) or given user to separated modules. By using role, you can tune up how a register member can be privileged then normal user how administrator can enjoy more privileged then a registered user and so on.
After having groups, you can create new user for each group. In order to create new user, you go to manage users (User/User in back-end), here you can create, edit, delete or active for any user. User will have default permission according the group that it belong to (thus one user can\'t belong to many groups). However you can still set special permission for individual user in a group.