get a tire
remove the wheel
release air from the tube
get tire levers
place the two tire levers in between the tire and the rim
pry the tire from the rim
run one tire lever along the inside of the rim to pop out one side from the rim
remove the tube from the wheel
after removing the old tire, find the valve hole on the rim
line up the logo on the tire with the hole
put one bead of the tire in the rim all the way around
put a little air into the tube
put the valve of the tube through the valve hole
stuff the tube in the tire
stuff the other bead of the tire in to the rim. be careful not to pinch the tube between the rim and the tire bead.
now for the very last part... push the valve up so the tube stays in the tire before snapping the final bit of bead in to the rim
sometime tires can be tough. I use a tire lever to pop in the last bit.
flip the lever up and push the rest of the tire on
go around the tire and look to make sure the tube isn't overflowing under the tire bead. this will give you pinch flats!
find the pressure of the tire ( its written on the outside of the tire) and inflate to that level. don't be afraid to inflate to the maximum recommended pressure. it won't explode.
put the tire back on and you're done