Instructions to put in a tampon
Squat down a bit with your legs open (I don't recommend putting one leg up, because unless you know the angle at which your vagina is, it might be uncomfortable).
If it has an applicator hold it by the ridges, or the vary bottom of the applicator tube.
Insert it into the vagina, not pushing it too far (can cause leaks...your fingers should still be outside of the inner labia to get the right depth).
Push the stick to insert the tampon in your vagina.
Pull out the aplicator.
If there is no applicator, hold the tampon by the very bottom and insert it.
Take your finger and push it in further, a couple of inches or whatever is comfortable.
You will know if you have it in right, because if you do, you shouldn't be able to feel it. If you can it is probably because it is not in far enough, but don't push it too far, because it might leak.