Get to know how the the interface is connected.
Step 1: Open the account settings.
Step 2: Click Amazon Connection.
Step 3: Under Selling Partner (Seller) or Selling Partner (Vendor), select "Connect now" (depending on whether you are a Seller or a Vendor). You will then be redirected to the Advertising Console.
Step 4: Now log in to your Advertising console. The following window will open:
Confirming the connection via "Confirm" completes the setup of the new interface.