You can delete your account from your account page. Before you do:
Download your keeps first. Deletion removes your library, and kept files can't be recovered afterwards.
Credits don't survive. Remaining balance — including purchased top-ups — is forfeited with the account.
Subscriptions stop. Any active plan is cancelled as part of deletion.
Deletion is immediate and permanent. If something's wrong that made you consider it — billing, a bug, anything — message us first; most problems are fixable in minutes.