How to get a refund

Hello, im pretty new from using a lightroom, this morning i buy a yearly subscription from lightroom for my school task, i buy it and using it once, but then the task is getting cancel and i decided to cancel my subsription. At first, i tought i will get a 7 days trial first before getting charged. Cause that is what written in there. But it Turns out, that i automatically getting charged when i first buy it. Can i get a refund from my subsription? Pls help me.