How can I tag an artwork or blog with a "Like"?

How can I tag an artwork or blog with a "Like"?

If you like a picture on ARTBOXY, you can mark the picture with "like". This is how it works: 
  1. Go to the desired post
  2. To the right of the post you will find several icons
  3. Click on the thumb pointing upwards
Under the icon you will see a number that indicates the number of "likes". If you click on the number, you will see which users have marked the image with a "Like".