right press "print screen" (it's the same as cut and paste ok)
then open paint in windows (i assume your using windows)
then in paint press "edit" then "paste" your picture should now be in front of you.
then press "file" then "save as" now make sure you save it as a jpeg, there's a box with the options
the pic will now be in your picture folder, just use imageshack to upload it.