Click the Playlists tab. Sign up for a Student/Member Account. If you have a Member Playlist account from other Naxos products, your email address and password will be the same login credentials for the NML app. [Website is currently undergoing updates. It may display differently to you.]
You will receive a confirmation email from Naxos Music Library. Click the link to activate your account.
Search for NML in the Apple App Store or Google Play.
Use the same email address and password you used to create your account to log in to the NML app.