To add a new product, simply go to the Products page in your Zibbet admin. You'll see a green button in the top-right of the page, and in the middle of the page if you haven't listed any products yet.
Once you've clicked the "Add a product" button, you'll see a modal appear, which asks you to choose what sales channel you'd like to list your product on.
You can list it on one, or multiple sales channels at the same time.
Clicking continue will take you to a page where you can fill out your product attributes for each channel.
Once you've filled out the page, you can choose to "Save as draft", or "Publish".
"Save as draft" means that the product is not active / viewable to the public. You can come back to it later to "Publish" it, which will make it active and available for purchase on the sales channels that you've selected.