Applying privately...

It's not hard at all, I also applied by myself. You fill in the empty fields (you'll know what to enter, they're related to you + they explain what each and every box is about when you click on the '?' sign next to it + there are explaining articles online). When it comes to the refference you'll have to find someone, an ex teacher.

Thank you! I have my reference from last year, do you know if I can upload that one? Or do they actually need to contact my old tutor?

My pleasure It is possible to do it, but forbidden, you shouldn't. You have to put down you referee's contact details, they send a mail there with a link, and the referee puts the text down. So you have the duty to not give any fake address (your aplication could be canceled if found out). You contact an ex teacher,entry their data and they can copy paste that reference that you already have, I don't see any issue with that. You can persuade someone from your last school to help you by telling them that it is a very simple and quick process (if the letter is already done), they can literally be done with everything is 5-10 min.