In this section, https://admin.taxicaller.net/admin/settings/permissions.php, you will be able to change the permission levels for your users regarding a variety of actions such creating and editing jobs or suspending vehicles and drivers.
The permission levels are either no one, everyone, or 1-4 levels. Level 4 is the highest, which means that if you set an action to Level 4, only this type of user will be able to do it. You can assign these levels to your users in the User section.