You can change the role of the users by following the steps given below:

1. Log in to Zoho CRM with with Administrator privilege.
2. Click Setup > Users and Control > Users.
   
3. In the Users page, click the Edit link corresponding to the user for which you want to change the role.
4. In the Edit User Details page, choose the Role from the drop-down list.
   
5. Click Save.

Note: Free Edition users cannot change the role of the users as they have only one role available in their account.