I might be able to help you if you havent found a tutorial already.
In your Tools bar you should have a Web Section.
The slice tool is in the top right.
Click and drag on your image like you would using the mouse to select an area. Once done, this area will appear as blue and a guide for the rest of the screen will have been created automatically for you.
Keep clicking and slicing until your entire image is blue.
Then goto File > Export and your HTML and Images. You can then open the HTML.
Hope this helps