1. Still working in the ButtonMe project, copy the button you added to slide 1 to the clipboard.
2. On the Filmstrip, select slide 2.
3. Press the [shift] key on your keyboard, select the last slide on the Filmstrip and then release the [shift] key.
All of the slides except slide 1 should now be selected.
4. Paste the button onto the selected slides.
The cool thing about copying and pasting slide objects is that, in addition to getting the object on several slides at once, the pasted objects are all in the same slide location.
5. Go to slide 3.