Hello
To add a score on the site you must first transform it into a PDF file with all the pages in the right order and in the right direction. Know where it is on the hard disk and know the exact title with the right spelling, the name of the performer and the composer. Because once in the form, it is not easy to remember everything.
Then, you have to go to the section PARTITIONS and click on the button ADD PARTITION. This will launch a menu with places to fill in. If the score is not already in the common pot, you will still have to click on some buttons in the form to send the file in PDF format if possible not too large and readable.
Romeo