Before you can configure the recommendations module, you need to upload a product feed. After that, fill in:
Your field of activity - it is necessary for more accurate work of algorithms and service improvement
Out-of-stock items - specify how your product feed displays out-of-stock items (they are absent or present with a certain value of some parameter).
Product feed with authorisation - if you want to receive product recommendations in a secure way, specify a login and password that will be used on the side of your site to access the recommendations.