It's easy to change your membership plan from Club iWin to All Access (or vice versa).
You will simply need to cancel your current subscription and initiate the desired subscription right after.
Within your account pages, select the cancel option:
After successful cancellation, your account will then have the 'Reactivate my Membership' button:
After you click on this, it will give you the option to select between All Access or Club iWin.
Note that your monthly recurring billing date will change to the date your new subscription plan is initiated.
Example: Today is September 10. If you are a current Club iWin subscriber whose re-billing has traditionally taken place on the 5th of each month and you switch to All Access today, you will be billed today and your new re-billing date will be on the 10th of each month going forward.