To include a product in a tour, the product must be uploaded to the Tour Planner.
To do this, check the „My Products“ tab to see if the product is available.

If the product is not available, you'll need to create it first. You can find out how to do that here in the wiki as well.

If the product is available, you can easily add it by opening the room planner in your tour and adding the product to the corresponding room.