How do I make my siggy full size, not just a little version of it? I've been trying for like a half hour, with no luck. Thanks!

When you upload the image, you should copy the "Hotlink to Forums" code or the "Direct Link to Image" code (add [img] tags if you use the second way).
The result will be this:

And the code is:

However, that's too big to use as a signature. Signatures must be within 500 by 200 pixels:

And they have to be under 60 KB.
Please resize your signature so it fits within the limits before you add it into your sig.

Ok, i'll resize now. Thanks!