75YikesDvds and CDs are learnables that go in your pets collections! Later used to pass some missions that require a pet to listen/watch one of them, and you also get fairy prizes the more you collect!
To edit your shop, go to your shop and scan the quick links at the top of the page and click the "Edit Shop" option!
I would send you lots of links, but I'm on mobile and it won't be long before someone else comments to help you out.