Connect - Change Subscription
If you want to change your subscription, go to My Account at flexibleshipping.com
Once you log in, you'll see your Subscriptions. You can View it or Switch plan. Use the second option.
Next, select the plan you'd like to enable for you. Click the Purchase button under the plan.
Enter your details. In Your order, you'll see either you upgrade or downgrade your subscription.
If you change your subscription during a subscription period, you'll pay the difference only.
As you see above, a user needs to pay $4.33 instead of $5.00.
Once you make an order, you'll get redirect to Order Confirmation page. Now it works!
You can always check out if the change is live.