Go to https://developer.amazon.com and on the right side of the screen click the yellow "Sign up for MWS" button.
If you are not logged in, you will need to log into Amazon.
You can visit Registering to use Amazon MWS For Additional Support
Go to the User Permission Page in Seller Central and click the Authorize a developer button.
Enter "Konnektive CRM" for the Developer name and enter "8697-6685-8860" for the Developer ID.
Click the Authorize developer button. Write down your Seller ID and your MWS Auth Token for later. It's a pain to get this information again so make sure you store this somewhere safe.