Don't know what to do after signing up at ustraveldocs

[calberry 18]

My mom and dad were able to get their interviews at the same time (even though their DQ was 2 months apart) which was a relief. In the "Immigrant Visa Interview Appointment" email it says to follow the instructions at https://nvc.state.gov/prep which then links to country specific instructions here where it says "All immigrant and diversity visa applicants must create a profile at http://www.ustraveldocs.com/np after receiving their appointment letter. This will allow applicants to process case inquiries, submit documents, and obtain updates about visa collection."

 

We then signed up on the ustraveldocs website but we don't know what to do with the site. My mom and dad already have their interviews scheduled and are preparing to schedule their medical exam. Are we missing something and is there something we should do with the ustraveldocs site?