I can't print still shots of images on YouTube?

[inukjuak90]

It is not enough to simply do a "print screen".   What you need to do is SAVE
that "print screen" as an image file to something as simple as Microsoft Paint.

The default setting in Paint is "Bitmap'' (.BMP) -- which is unnecessarily huge;
so I usually choose the smallest and most-efficient option:  ''Portable Network
Graphic" (or .PNG).  Once that image is saved, all you need to do is upload it.

:-)