Huw,
There is no 'renew subscription' button. Simply click into the extension you want to purchase from the
Subscriptions
page. If you have an active subscription for JFBConnect or JLinked, you'll see the discounted price on the checkout page.
As for the duration of the subscriptions, the extension we use goes by days, not months. We use 182 days for a 6 month subscription. Depending on the day you buy the subscription and how many 31 vs 30 day (or even 28 day) months are in that period, the exact expiration date won't be on the same day you bought it.
Hope that makes sense. If you miss the window to repurchase today, just let us know. We can re-extend your subscription a day if you'd like so you can take advantage of the upgrade pricing.
Thanks,
Alex