10 questions from any exercises are absolutely free of charge and available every day. Access to exercises is updated every 24 hours. You can continue to use the site or not to use it without any consequences; any of your personal data aren’t available out of the site. It is possible to cancel Site news subscription in the Private office on Subscription tab. 

But if you really want to permanently delete the account, you need to go to the Profiles section, then the green shield icon next to the Parent's name. 

In these settings, click on the Delete Account link. An email confirming the deletion will be sent to your email address. Please note that after confirmation, all your account data (including awards, reports, class history, transaction history) will be deleted without the possibility of restoring them.

Options for Gests, registered Users and Users with paid account are different. Compare:

Guests and registered Users can answer 10 questions a day in any exercises. Users with the Paid account can use the Site without any limit.

Guests can't receive and see the child's awards - medals, cups, and coloring. And weekly homework which can be printed and completed on paper is available for only Users with the paid account.

Reports on children progress are also unavailable for Guests, and registered Users can see Statistics reports.

All users can use one demonstration day of Erudite training, and users with the paid account every day pass new training on three subjects and can even create their own training for the child.