Hi JoeJazz,
How did you transferred your score to your iPad?
In Mail, simply open the email with your score attached and tap on it to see Open in "Scorch".
In Dropbox, select your Sibelius file and tap the 'Open with' button in the top right corner and choose Scorch from the list.
You can see pictures for these steps:
("Sharing Sibelius files with Scorch")
http://avid.force.com/pkb/KB_Render_...Dk2&lang=en_US
Thanks