Note: You will only be able to change the security role for a user if you have the appropriate access to your site.
1) Login and click on Settings on the green bar.
2) Click on Employee users setup.
3) Click on the name of the employee you would like to edit the security role for.
4) Check/uncheck the box/boxes next to the security role you would like to assign to this user. Finally, click Save.
5) You will get a confirmation message, click OK.