Whether it's a Board, a Session, a Memo... Once your activity has been launched, you can send an email inviting people to take part, which enables them to access the activity quickly.
Access the sharing options:
entering participants' email addresses, or
copying the link that is generated
From the "Share" menu
Then click on "Invite participants"
From the "3 little dots" menu
Click on the 3 little dots at top left
Then click on "Share
From the Studio
Click on "Share