Task: I'd want to share the hiking reminder with my friend Rick via his email address rick.weinstein@dayrep.com via Gmail because we're planning to go hiking and he'd like to set the same reminder.
Steps:
click on the Hiking reminder
click on the share icon 
enter the email id of receiver rick.weinstein@dayrep.com
select the id
click on the send icon at the top right side of the screen