Arrange all the windows you want to capture together (just neatens it up I hate full screen shots with only 3 or so windows open such a waste of space) - if you dont know what i mean look at some of my screen shots

Hit print screen button

Open photoshop

Make a new window, then go 'EDIT' -> 'paste'

Go to 'Image' -> image size

resize to ~900 wide

save as jpeg ~ 200 - 300kb in size

upload