This option is only available if the user has accessed the facility thanks to a valid multipack. The steps to add/delete an access are listed below:
1) open the user's profile
2) click on the multipack's row to open the detail window
3) click on Classes
4) click on Add Access
5) confirm the access type (you can choose a different one if available and add optional notes about the access) then click on OK
6) click on Save Changes