Keeper.sh now has a support page that collects how to get help in one place: the address to email with a question, and where to file bugs and feature requests on GitHub.
It answers common questions directly: how often calendars update on each plan, what to do when an event has not arrived, what colleagues can see of your personal events, and which calendars Keeper.sh works with.
Its plans and billing section covers what Free and Pro include, how to change or cancel your plan from the dashboard, and that you keep Pro until the end of the period you paid for. The account section explains how to delete your account and how to request your data.
The troubleshooting guides each start from a problem you can see in your calendar.