Forgot to cancel the free trial

So i wanted to try editing on premiere pro to get some expireience for when i want to purhcase it later on, so i just got the free trial.

I used it once the first day, got confused and couldnt figure out how to use it, and never used it again.

Looking at my email today though, it says that i have submitted an order for $20.99 every day. 
I am worried as i dont understand if this is bad and i dont know how to fix it, so i would maybe like some help? Or if i can just not get charged because i only used it the first day.

Thanks!