How do I add a manufacturer?

Yes, from the "Catalog" tab you can select "Manufacturers". Then just click on "Add" and fill in the name of the manufacturer you would like to add. Repeat until you have created all of the manufactures you would to list. Then, when you are creating or editing a product, simply click on the "Advanced" tab and select the manufacturer from the drop down box. Customers will then be able to see who manufactured the product, as well as click on the name of the manufacturer and see any of their other products that you sell!