Changing the subscribed Plan

So.... i have subscribed to 'Adobe stock - 10 assets a month' for 1 year because it was in special offer month ago, and i thought i (can) only have to pay the bills which it was offered BY special offer. In the first month it worked, but somehow in the next month i had to pay the more than a doubled price than it was originally offered.  (maybe i missunderstood the offer but thats no the point)

So i have decided to cancel the plan, but i realized i have to pay extra bill for that, so i gave, and decided just to change the plan.

And i wanted to change it to Photograpy plan cause i am only going to Ps....... but i dont know how.

Can somebody help me with this problem? I will be really greatful