Once you've created a login at https://app.energomonitor.cz and registered your Gateway, simply go to "Settings", and then "Account".
Here you'll be able to see the status of your account for your Gateway.
If the "Subscribed Until" date is unknown or set to a past date, you'll need to update your subscription.
Simply click on "Pay Now" to go through Energmonitor's PayPal system, make payment and you're good to go.
You have one channel of data for free forever. There are 29 additional channels that can be accessed with the subscription. The data subscription costs Euro20.00 per year.
If you have any issues, please contact [email protected] and they'll look after you.