Nothing shows up online in your reservation. That is why I use the email system on the
DVC site to make requests. You send an email providing your reservation including reservation number and set out your requests. They first send a fairly quick email acknowledging receipt. Then later (could be days), they send a confirmation email stating your requests have been added. Many months later when I forget if I ever made the requests or which ones I made, I just go to my saved emails for the trip and see what I did.