This is something you will need to know how to do if you have a bike in case you get a flat.
. First you will make sure all the air is out, and take the tire off the rim and take the tube out.
. Next you will check the cause of the flat tire, check the tube, get rid of the damaged tube, get a new tube, and put it in.
. Next, you will make sure you put some baby powder on it before you put it on, and then lay the tube in the rim.
. Last, you will push the tube between the tire and the rim and press the tire over the rim.