How do you use the pants stretchers found at Walmart?

The Walter Drake Pants Stretcher system sold at Wal-Mart is an adjustable device placed inside each leg of a pair of pants. Slip a single rectangular stretcher from the waist down the crease of each leg. As the stretcher advances, it stretches the pant leg.

Pant stretchers are a way to remove creases and wrinkles from pants without the need for ironing. The stretchers can be adjusted vertically and horizontally. Vertical adjustments are made to fit longer or shorter pant legs. Horizontal adjustments are made to snugly fit into the crease of the leg and stretch along the width of the pants.