Here is instructions I found Online
Inflation Instructions and Care
Inspect
Please do not open your package with a sharp object. Remove the ball from the packaging and inspect for any damage that may have occurred during shipping. It's normal for the ball to have slight creases (fold marks) when first inflated. Make sure the ball is at room temperature before proceeding.
Inflate
Remove the plug from the ball. Do not use a sharp object to remove the plug. A coin (quarter) can be used to raise the plug enough to pull it out. The manufacturer includes a packet containing an extra plug. Bicycle pumps are designed to inflate low volume to a high pressure. Exercise balls have a large volume and a low pressure. Pumps designed to inflate large items work best on exercise balls. Free inflation pump now included.
The balls are inflated according to size, not pressure. Never inflate the ball larger than the recommended diameter. Each ball has the maximum diameter (width) printed on it in centimeters and inches. To insure proper inflation, place the un-inflated ball between two flat, upright surfaces, such as a wall and a box. Make sure the box is the same distance from the wall as the ball's diameter. Inflate the ball until it just touches the 2 surfaces.
Care
- Check the area and clothing for sharp objects that may puncture the ball
- The ball is not intended for outdoor use
- The ball should be inspected for gouges and deep scratches before each use
- Clean with a soft cloth and warm soapy water. Do not use harsh, abrasive chemicals
- Contact with any ink such as that found on newspapers and photocopies will permanently mark the ball
Safety
The exercise ball is an unstable surface so inspect the area you're working out in for any possible objects that may cause injury if you should suddenly fall off the ball. If you're new to exercise or have not exercised in a while then start your program with a visit to your doctor for clearance. We always recommend taking advantage of working with a certified instructor or trainer with A.C.E. and/or ACSM certification.