You can add any set to favourites list by clicking "plus" icon on the thumbnail preview of set.
Click on "Favourite sets" link in top menu to view all sets you select.
Last added sets displayed first. Number near link shows how many sets you have selected.
On "Favourite sets" you can click on any set to view it or click "minus" icon to remove
set from favourite list. To remove all sets from favourites you can click "Clear favourites" link in
"Favourite sets" block on the left of the screen.
