You can renew your subscriptions by following the steps below:

Go to ACCOUNT > SUBSCRIPTIONS & BILLING (1) as shown below.

Click the "Subscription Info" button (2)

Click the "Renew" box next to the subscription you wish to renew (3) and then click the blue ADD button (4).

On the page that follows confirm your subscription selection and choose a payment method from Manual Payment (EFT) or Credit Card or  as shown below: