Changing a flat tire is a VERY common repair on a bicycle. Here are the steps to fix a flat tire on a bicycle.
First, make sure you are in the smallest gear. Then you undo the brake. Then pull off the tire. After that you need to take all the air out of it. Then use the tire lever to take off the tire. Then pull off the tire then see what is in it. Put the new tube back in and make sure when you put the tube in the tire. Then, pump it up to the right psi using the air pump and put the tire back on the frame, then put the brakes back on. Also make sure you have it on right or the will bakes rub. Then strap the tire lever back on then you are good to go.
First, make sure you are in the smallest gear. Then you undo the brake. Then pull off the tire. After that you need to take all the air out of it. Then use the tire lever to take off the tire. Then pull off the tire then see what is in it. Put the new tube back in and make sure when you put the tube in the tire. Then, pump it up to the right psi using the air pump and put the tire back on the frame, then put the brakes back on. Also make sure you have it on right or the will bakes rub. Then strap the tire lever back on then you are good to go.