Inserting a tampon should not hurt, try to stay relaxed. If you can feel the tampon when you sit down, or it feels uncomfortable when you walk it is not inserted correctly. Take it out and reinsert it. Tampons are removed by pulling on the string which stays outside the vagina. Tampons should be changed every 3-4 hours.
Pads absorb the flow of blood from outside the body.
They adhere to the inside of your underwear. Pads should be changed every 3-4 hours, this may need to be on a more regular basis for heavier days. Don't flush pads or tampons down the toilet. Many public toilets have sanitary disposal units. You should place them in these, otherwise wrap tampons or pads in toilet paper and place in the bin.