Tick the Show My Administration Tabs box.
This will make more tabs appear. Choose the Suppliers tab.
In the New Supplier field type in the text for the supplier you are entering and click the Add New Supplier button.
Click the Get My Suppliers button and then use Refine Search function to find the brand you just entered.
This supplier will now be available to link to your ingredients, either when you first create them, or when you are editing them at a later time.