You need to add a product to your campaign before it goes online. You can also add products after the fact. Here's how to do it:
- Click on the 'Campaigns' tab
- Select 'Manage products'
- Click on 'Add product'
- Fill in all the product fields.
Please remember to save your work at the end.
Once the product is created, it will appear within your product list and you will need to allocate stock against it.