User blog comment:Cool Pixels/Costume Contest/@comment-24657722-20140506163333/@comment-4747848-20140506163851

Just press print screen (PrtSc) on your computer - it's next to F12. After that, go to a photo editors like MS Paint, PhotoShop and GIMP. Then, you can press paste to paste it on; save the image into your documents and upload it to the wiki via the upload button or Special:Upload.

Hope this helped! Any more questions, just let me know!