Summary: All of the calendars that are shared at Hilltop have a person who owns them. 

1. Locate the calendar you need by adding it to your "Other Calendars" or by finding it in public folders.
2. Right-mouse click on the calendar and click on properties
3. Click on the "Permissions" tab
4. You can then click on the individual people and see who owns the calendar. 
5. If you are listed as an owner, you can click Add to give permission to the calendar. 
6. Search for the name of the person you would like to add in the window that opens, select the name so it is highlighted then click Add in the bottom left and then OK.  
7. Make sure to give them Proper Read/Writer permissions.
8. If you are not listed as an owner, look for the owner and send them an email with the permission settings you are requesting.