From the xCenta Dashboard, click on Tools > Admin in the top right of the screen.
A new screen will appear. From the Administration screen, click on Manage Roles.
A new page will appear, choose the relevant role.
Scroll down to the bottom of the page and click Delete.
A new pop up will appear, click OK.
If you are unable to follow these instructions, you may not have the required user permissions. Please contact your Site Administrator.