Link a text and/or image to an email address, you have to:
Click in the cell text editor in which you want to edit this link
Then, in the cell select the text or the image which will be used as a link
Click on the icon to insert a link
Select the type of link “Email” and add the wanted email address
Click on the button “insert”
When participants will click on your link, they will be redirected to their mailbox with the recipient's address pre-filled.