In many places it is required to share items between users in a domain or across the system. In these cases, accessed by clicking the Share button, the Access control list will be displayed.
Altering the access rights of users in the domain is a matter of changing the selected options and clicking update.
To add a non-domain address to the list, it should be typed in the address box and the add button clicked. See User Interface Guide
To remove access rights for an address clear all the options and click update.