Click dropdown menu to the right of the calendar you want to share.
Select "Share this Calendar"
Step Two
In the box below "Share with specific people" add the email address appointment.set.one@gmail.com. Under "Permission Settings" choose "Make changes to events" and click the button: add person. Then hit one of the save buttons.
Step Three
To ensure that you have added your calendar correctly, go back into "Share this Calendar" (instructions above) and verify that appointment.set.one@gmail is listed as seen below. If it does, you are done!