Watch this video, https://youtu.be/edFykMFYDKg .
First, remove the stem cap from inner tube. Next, pinch the tire with one hand behind the stem to push the stem outward. With your other hand, place the head of the pump on the stem as much as possible. Next, lightly bend the stem away from the spokes while keeping the pump on so the lever on the pump can be lifted. This will create an air lock. Pump until the tire is quite firm to the squeeze but not basketball/ rock hard. If you don’t hear and feel air going in the tire, try re-attaching. We recommend 25-30 psi not the 35 psi on the sidewall of tire. For further assistance please contact your local Bumbleride retailer or our customer care department at 1-800-530-3930 or email@example.com .
Link to our favorite tire levers, Pedr's Tire Levers, http://pedros.com/products/tools/wheel-and-tire/tire-levers/