If you purchased a single session for the first session of a given month, and would like to upgrade to a monthly subscription PRIOR TO THE SECOND SESSION of that month, the cost to upgrade is $10 (as you have already paid $15 for the first program.)
Once you have upgraded, you will have access to the replays and downloads of both of that month's sessions as they become available.
If you register for a monthly subscription AFTER THE SECOND SESSION for the month has already aired, your subscription will start the following month, and your card will be charged $25 (on the 2nd day of that month.)
To upgrade go to this link and click the Monthly Subscription Button:
When it asks you to log in, the system will know you have already paid $25 and only charge you $10.