If you want to set some access levels for the role means you want that the users of any particular role can only access the features or modules that you give permission to them, then click on “Set Access” option available at the right hand corner of each user in the list of all users.
When you click on this option, a page appears that help you to set access level for the particular role you have selected. From here, easily tick mark or un-tick the feature you want to give access to the role or not.
After selecting the features or modules, click on “Save Privileges” button to set access level for the role.