Firstly, you need to create a seller account – click on My account and then enter your email address in the New Users, Please Register Here box and click on Register. This takes you to the Registration page where you should complete the Sign in Details and the Contact details. This will create a Buyer account which can easily be upgraded to a Seller account from the next page.
Once you have a Seller account, you can upload scores from the My scores page. If you are uploading Sibelius files, Score Exchange can automatically extract instrumental parts (using the Dynamic Parts that you have configured where possible) and as much other information as possible from your score. Once the process is complete you can review and edit any of the information about your score.