Log in to the Fourwaves account you wish to delete.
From the top right user menu, click on My account.
At the bottom of the Profile tab, click on the red Delete account button.
Confirm deletion by typing in DELETE.
What deleting your account removes
When you delete your Fourwaves account, Fourwaves also deletes your data in all events:
Your registrations and your submissions.
Your name in the authors list of submissions by other people.
The reviews that you wrote, and the reviews of your submissions.
Your transactions stay in the event records, because organizers need them for accounting. The organizer still sees your payments in Payment > Transactions. Your registration is no longer in Registration > Registrations.