What do you want to do with it? Make it a link?
Grab a book on HTML and read up on it first before trying to go any further with your project. It'll probably answer most of the questions you have right now.
If you want to use one or both of the slices in the yellow as a link, just wrap the IMG tag. <a href="http://www.yahoo.com" title="A Search Engine"> <img (your image in the HTML file you want as a link......> </a>
If you want to add text where the big grey slice is (11), then delete that slice and paste the text in that cell. Set the background color to the appropriate grey.