On dashboard you can take tour, click on next
Most important part is select package, without selecting package you can’t use online billing software.
On left sidebar click on setting – Package Subscription or use this link https://billing.thecodecomposer.com/subscription
You can there is No active subscription found
Scroll down and click on subscribe (if you want to test) or if you already test and want to continue using online billing software, then Pay & Subscribe.
Watch this video