On your iOS device
Open up the Calendar app
Tap Calendars at the bottom
Tap the ⓘ next to the calendar called "Sugarmate Readings" in the ICLOUD section
Tap Add Person in the SHARED WITH section
Enter the Apple ID (email) of the user you want to share your calendar with
The person you shared your calendar with should receive an invite. If not, have them open the Calendar app on their phone, then tap Inbox at the bottom. If an invite is not there, repeat steps 1-6 above on your phone.