How do I add Target Attributes to the Import Objects field to conduct an upload to update address?

Summary:

I need to upload address changes. I went to Tools> Import Management> Import Objects

I only see three Import Object Details, and when I click through them, I don't see any of the Address Line # Attributes. It appears I need to add each address line attribute, but I'm unsure of the specific steps to start. I have done many uploads in Paycom, so I understand the intricacies of them, but I'm unsure of how to start the process. The discussions that I was able to locate in this forum, started quite a few steps into the process, and I'm not sure the pathway to get there.