First, you will need to link accounts to connect them. If you are the owner of a Noteflight Learn site, then your Noteflight Premium and Noteflight Learn accounts are already linked.
You can then go to your score list that contains the score(s) you wish to transfer. Click "Edit List" at the top of the page, then click the eighth notes to the left of each score title you wish to transfer. When you’ve selected all the scores you wish to copy, click "Copy to Site." Select the desired destination from the list and confirm.