I have a jpg of a signature. When I insert it on a document it covers the line that I'm sitting the signature on. So there is some sort of background behind the signature. I want it to look like it would if you actually signed your name on a line. You would be able to see the line through your signature. Can I do this somehow with Fireworks 8?
If the text is black on a white background, you can set the blending mode to Multiply. (It's just above the layers, where it usually says Normal.)