How do I add a member to Favourites?

Hello Andrea. You simply click their name, and add to favourites from there. 

Note: The default frequency setting when you click that button is daily. If you want to change the frequency you can go to your favourites page and change there, else if you click on View sellers other listing link you go to their main page and you can choose the frequency of being emailed there directly, as you add to favourites.