You can assign roles to a user by navigating to
A user automatically inherits roles from all groups the user belongs to. These roles
cannot be deleted from the user's record, only from the group's record. Roles can
also be associated directly with the user.
To add roles to a user's record:
Open a user's record.
In the Roles related list, click
Select the desired roles in the Collection list, and
then click Add.