Thanks! And it was supposed to be a cannon, but I couldn't think of any other way to do it. I remembered seeing something similar, so I tried it and ended up with... Well, not much of a Castle cannon, but it would work perfectly for the Republic or Empire.
Now for what I did; I looked at the tutorial, I saved it as JPG, (no clue why it went up as png) I went to Brickshelf, made my account, (forgot my old one) uploaded it, copied the URL, logged in to Eurobricks, went to Castle forums, made a new thread, clicked on Insert Image, and pasted the URL where it wanted it. I thought I did it right, but I guess not.