Go to the 'Card User Details form of the required user record, then click on 'Sub Menu' > 'Restrictions':
The 'User Restrictions' form for the selected card user will be revealed:
Select the required restriction from the list so that it is highlighted in green.
Click on 'Delete' at the bottom of this form for the following message to appear:
Click on 'Delete' for the restriction to be deleted.
When you have finished, click on 'Close' at the bottom of the 'User Restrictions' form to be returned to the 'Card User Details' form, on which you must save the change/s that you have made.