Well its hard to explain, you need a visual, so look it up on google for a visual, but what I can tell you here, is that you need to use baby wipes on his bottom, and fold up the diaper in a specific way (find a visual) by rolling it up, and using the flaps to secure it, and throw it in the trash can, next lift up his legs in one hand and a do the wiping with the other, then put the top of the diaper under him, and fasten it (again get the visual) also to keep him distracted give him a toy, or turn on the T.V. While you're doing it, the first time changing a diaper takes a couple of tries to get it right. Hope this helped :)