If you are not sure how to configure Logic with your interface, we strongly advise you read the Logic manual carefully, or try one of these free guides:
Logic Pro X: The Beginner’s Guide (text guide with screenshots)
Ultimate Beginner's Guide to Logic Pro (full 5 hour video course!)
Logic Pro X: The Beginner’s Guide (text guide with screenshots)
Ultimate Beginner's Guide to Logic Pro (full 5 hour video course!)