You can change the role of the users with these steps:
1. Log in to Zoho CRM with Administrator privileges.
2. Click Setup > Users and Control > Users.
3. In the Users page, click the Edit link corresponding to the user you want to change the role for.
4. In the Account Information page, choose the Role from the drop-down list.
5. Click Save.
Note: Users in the Free Edition cannot change the role of the users as they have only one role available in their account, by default.