I want to cancel the" downlode setting",what shoud I do ?

At the first,I regard the firefox as my downlode tool ,then I found that it is too slowly ,so I want to change my setting ,but I can not find the right address.

Please contact Adobe Support for cancellation Contact Customer Care as the CC (yearly contract) which are more than 30 days old has cancellation fee associated .
If you have purchased through digital river store then also Supports needs to cancel it.