How to cancel my subscription?

I was wondering how to cancel my subscription? I thought I only signed up for one year. Last month I noticed from my bank  that I was charged on my credit card, but didn't get any notification from Adobe that I was being going to be charged for another year or renewed. I honestly did not know why ADOBE was charging me. Thought it could be fraudulent, since I did not authorize ADOBE or any other party to charge my card. I tried to dispute the charge through my credit union, but told me to contact you. I was unsuccessful in trying to find a contact number until I saw this forum.  Can you please cancel my subscription and any refund that is applicable. I would greatly appreciate it.