You received the scholarship pretty late (Normally people receive it in Jan and get paid in March). For all my scholarship offers, I was sent a scholarship offer letter (on UNSW scholarships). Go to your submitted applications and click view offer letter. They will then ask whether you want to accept or decline the offer. When you click accept, they will give you another link- leads you to the form where you fill up your bank details etc.
They take a while to appear. It varies (few hours to day). If you are really worried, give them a ring