Task: Go to the Keep Notes app and share your appointment with the doctor with others
Steps:
Open the Keep Notes app
Click on the menu icon at the top left corner of the screen
Click on the Reminders at the left side of the screen
Click on the reminder in the reminders section
Click on the ellipsis icon at the bottom-right corner of the screen
Click on the third option 
Click on send via other apps
Click on messages at the bottom of the screen