When choosing to sell an Interactive Score, you will be directed to connect to your Noteflight Marketplace account, where you will be able to publish your Noteflight scores. (Note: you must be a Noteflight Premium Member to sell scores via Noteflight Marketplace.)
Interactive arrangements will be distributed through Noteflight, Sheet Music Plus, and Sheet Music Direct, where customers will have the ability to access advanced features like audio playback, transposition, tempo control, variable note sizes and more.
For more details on publishing Interactive Noteflight scores, please see here.
If you would like to get started with Noteflight, you can create an account here.