How to un-enrol (restrict) an individual account?

How to un-enrol (restrict) an individual account?

Hi,
To allow us to test the user experience I need to remove an account from the system but can't seem to find where I can do this.  I have tried searching for the account in the license management - restrict user section but I can;t work this out.
 
thanks,
 
Jason

                  New to ADSelfService Plus?