Changing my application again (because I messed it the first time)

I had to change my student finance to my insurance uni, when I applied I accidentally chose to stay at home where I would have been if I had gone to my first choice, however I need a loan to live away. However when I go to change this (my application is still being processed). When I go to change this it directs me to a document I need to fill out and post and which claims it requires atleast 6 weeks to process. I was just wondering if anyone knew how to circumvent this process? Is it possible/ a good idea to cancel this application and reapply or will this take too long and risk not getting my loan in time for tuition fees.

Thank you.