1 - In order to successfully configure a channel to Amazon Product Ads, you need to follow the directions as shown here.

2 - For a channel to Amazon, there are simply two additional fields, as shown in the image below.

3 - The two essential fields (FTP UserName and FTP Password) can be easily found at your account at Amazon Seller Central. See details here.

4 - NOTE - At Amazon Seller Central, your FTP Password will be hidden behind a row of asterisks. The only way to display the password (in order to copy into DotFeed) is to use the link to "Generate a new password".