Student Finance Application - Parent's Name Incorrect

Hi. So I have made an application for student finance and for some reason I put my mum's maiden name down instead of her full legal name and now she has an email with her maiden name on it. How do I change this or can I cancel my application and start again. Thanks.

Hi there, In order to change the name of your mum we would require a cover letter along with a clear copy of a document that confirms the correct name. Thanks, Angela

Do I need to send this by post or email, and is there an address/email address for this? Thanks.