Once you have installed the app, logged in with your account, and located a score your want to use (see above):
Tap on an edition to view the scores and parts available, and tap on a part to open it in nkoda. The scores you open from the nkoda library will appear in your Recently Played section in My Library.
To open scores saved to your library, select My Library from the menu bar. Tap the part you would like to open. Once the score is opened, you will then be able to navigate through the score and make annotations.
Even if you have installed the app on more than one device, you can view content on only one device at a time.