To put a 10 year old on or in diapers you lay them down on the floor, bed, changing table etc.
Then remove the 10 year olds pants and underwear and then get a diaper out.
Unfold the diaper and place the diaper under the 10 year olds bottom with the tapes in the back.
Next pull the front of the diaper through the 10 year olds legs and then fasten each side of the diaper with the tapes or Velcro on each side.
Make sure it's tight enough so that the diaper does not fall down but not too tight.
Then run your fingers through the leg gathers to ensure no leaks occur between the legs.
After that you can put the 10 year olds pants back on or let them run around in just a diaper.

