You can change any of your subscription settings at any point in time. You're in complete control. Head to your subscriptions tab and everything can be changed right here.
What settings can you adjust? Your Coffee Tier, Shipping Frequency, Payment Plan (save money by paying ahead of time), Coffee Roast, Coffee Type and Coffee 'Flavors'. Lower down on your Subscription Tab you will also find links to edit your address and what credit card is attached to your account.