I'm currently on a monthly plan for Lr & Ph but wish to change to an annual payment plan...

Hi... I've recently received an email from dobe to say my monthly plan for Lightrom & Photoshop will increase by 50%, as follows: "The price of the Photography plan (20GB) annual, billed monthly plan is changing from £9.98/month to £14.99/month (including applicable Tax/VAT) on your next renewal date. To maintain your effective current base rate (excluding any promotions) you can change your subscription to an annual, prepaid plan."

Try as I might, though, I simply cannot find a way of changing my payment to an annual basis in order to retain my existing annual cost at its current level.

Please can someone help me with this. Many thanks.