You can add an item to your Wishlist that is visible to your Neighbors.
1. Open your Storage or click on a production building, find the item you want to put on the list and click the Wishlist button (it is a pink button with a notebook icon).
2. Click the + button in the popup to add the item to the Wishlist.
3. If you want to remove an item from the Wishlist, press the x button.