Modifying role means assigning or removing privileges. To do that, go to:
Administration > User management.
From the content menu choose Roles.
Click on the Role name that should be modified.
On the Role management page, find the necessary privileges group.
Do the following in a particular privileges section to change the privilege with the role.
At the bottom of the Role management page, click the Save button.
Click on the sign to select privileges.
To assign a privilege, click on the toggle sign next to the privilege name.
To remove a privilege, click on the toggle sign next to the privilege name.
