A pepper is a bit easier than a tomato. Here we have a pepper that was found hidden in a corner of the countertop behind some other stuff. These things happen when you have kids. As you can see it's way past it's prime and inedible at this point. Good thing is we forgot to save seeds from this variety, so, even though it is half rotten and moldy, it's a perfect candidate for seed saving.
Cut the core out of your pepper. Carefully remove as much of the meat as possible. Set the core on a sunny window sill for a couple days. By then the seeds will be dry enough to rub off with your thumb. If your pepper is of the hot type you may want to wear gloves. Definately do not touch your eyes or any mucus membranes while handling hot pepper seeds. They often hold the most caspation.
Rub your seeds out into a bowl and set in a dry place for a couple weeks. Store in paper envelopes to prevent mold formation. Because this pepper had mold inside it. I will be washing these seeds before redrying them on a piece of screening, then I will put them in a paper envelope for storage.