An excellent question! If you're looking at a title in our collection then you should see a button that says "Hold" like so:
Or if you're looking to recommend that we purchase an audiobook for OneClickdigital you can fill out a purchase request. If you go to the "My Collections" area of your OneClickdigital account, you should be able to select a portion called "Recommend a title". From here you can see what you've recommended:
