I made it with photoshop, the way cure said ;)
It's not supposed to be good, just a quick thing to help you understand tall pixels.

Yes, software = program. Some make using tall pixels easier than in Paint, but you can also carefully do it by hand if your piece is not too big.

Another great tall pixels piece here.

Also, Slender man is a hoax = not true!

 So upload the file from paint directly, just as you worked on it, without enlarging the image. He probably made your piece tall by resizing it so the vertical dimension is 50%, the resizing again so it's 200%, so the pixels are squashed then stretched. Not the ideal way to make a piece tall pixels, grafx2 has a feature for pixelling directly with tall pixels, it's free and better than paint for pixelart.

 How did u make that thing on my work?

Is siftware ment by pogram? If it is, I only use paint from windows 7

What cure says. This is x3, technically x2 would be tall pixels but missing the challenge point.

Everything must be made of vertical 1x2 pixel clusters. This is tall pixels. Check the previous tall pixel challenge carefully!

What software do you use?

 I don't know what screencap is  

So... what do u mean about tall pixels?

 The challenge calls for tall pixels. Just submit the piece at the resolution you made it at, it takes an extra step to enlarge an image, not get it to its normal size. Did you screencap it or something?