How do you unfold a proshox elite2 cushioning treadmill?

By reading the directions first. Treadmills are made by a variety of manufactures in a variety of designs and each may have a completely different method on how to do so. If you have lost the directions, do a search online for them by name of manufacturer. Most times, you can find the directions for free or at very little cost. The directions may also be available on the manufacturer's own website.