Configure User Role
You've learn about each user role responsibilities, if you haven't yet you could learn about each role responsibilities at this section.
Only user with admin as it's main role which could configure the user(s) main role and it's extra role.
Recall that user other role consist of two different role the Project leader and the Project issue assignee role, these roles are not mandatory for a user to have, each user could have one or more of these other roles.
Currently there's only two options of the user other role the project leader and the project issue assignee, since both of these other role are related to the Assesment Project feature hence these roles could only be configurated via the Assessment Project page and we'll cover this Assesment Project topic on this page, however when you main role is as a employee via this roles & access page you could see who is who have assigned as some role.