Claiming Youth Allowance ?

ive sent in a claim to get youth allowance and they sent me some forms to fill out including a tax file number form and parental tax year details stuff. I remember requesting a form that is titled "authorising a person or organization to enquire or act on your behalf" I remember this had something to do with who would receive the payments directly, me or my mum, but I can't work out how I can get the centerline payments to be directly put into my bank account. can someone please tell me how I can do it?