Please don't (use that as your signature). It's really annoying to have big signatures like that. In fact when people do that I just put them on ignore, as it's rude. A couple of posts take up the entire page. What you want is an image that is short vertically and wider horizontally. Try re-organizing your image so that all four of the boxes are side by side horizontally, would be much better.
Once you get it how you want, you go to "user control panel" and "edit signature". But before you do please fix your image. I don't want to have to put you on ignore