You manage your domains and DNS settings from the dnsjuice client area. After signing in, open the DNS management section for the domain you want to work on and make your changes there.
That is where you typically review name server assignments, add or edit records, and check service or billing details tied to the domain. If you cannot find a domain in the interface, first confirm that the domain has been added to the correct account and that its service is active.
For registrar-level changes such as switching authoritative name servers or creating host/glue records, you may still need to log in to your domain registrar separately.