If there is a particular advert you like and want to save for later, you can mark it as one of your favourites by clicking the heart symbol on the listing. All adverts you have marked as a favourite are saved under "Favourite Adverts" on your account page.
Inactive Adverts
If you previously favourited an advert but can no longer see it under "Favourite Adverts," the listing may have been closed. Tick the box "Include inactive adverts" to see any closed adverts on your favourites list.