Seller Central Account Required
For the Seller Edition of Sellics you will need to integrate to Amazon's API. At this time the API only works with a Seller Central, ie. it will not work with Kindle accounts or other Amazon programs.
You could use the Sellics vendor edition which can integrate AMS (which is where kindle sellers can advertise in the US), but it must be noted that the Vendor edition's pricing is more geared towards big brands / vendors.
Additionally for the purpose of keyword research, you can use our free keyword research tool Sonar.