Hails guys! We were asked many times to add this feature so here we are!
Now when you visit any post right under post's description and next to the "Rate this video!" there is "Add to Watchlist" button. Click it to add a post to your watchlist and get back to it later.

The Watchlist itself can be found at your personal profile (menu item "Watchlist").

Read more about where to find and how to use it here

Enjoy your new feature! More to come soon!

Sindie