Copy and pasting a certain part of the image

Ive recently started using Cortel Painter Essentials 5, and am having some difficulty. Im trying to make a background for an image Im later going to add layers to. The background is peaches. Ive drawn one peach and want to cut the image of that peach and paste it over and over in the background. Since ive just started, Im pretty confused on how to do that. I tried to use the stamp tool but cant seem to get that to work. Ive also tried tracing the peach with the magic wand but dont know what to do from there. Youtube and other parts of the internet hasnt helped me at all honestly and I havent seen any similar questions on this website. Help would be greatly appreciated.