Use the Screenshot Mask with image.

How can i add the SS mask with an src image code in html?

I want to add 3 images under each multiplayer game but i want them overlapped by the screenshot msk PNG image.

the simple way - combine your screenshots with the mask manually (no html/css knowledge required), you'll find the mask png inside template's images folder.

The harder (and maybe smarter) way - to  find out how it's done in the "Toys" template and do the same thing with your screenshots. To find out how the masks are working you should check the files block_catgame.html and styles.css