How do I add all other users to this:
In the "Enter the object names to select (examples)" field.
Windows has a built-in hidden group 'Everyone', but it is distinct from 'all other users' in the sense that it includes you. Since denied permissions take precedence over allowed permissions, you cannot use this group to prevent anyone but you from accessing the object.
Instead, you should untick the 'allow' checkboxes for all relevant user groups and add yourself as an exception, e.g.: