If you are signed in, open Profile → Settings → Delete account. Read the information shown, then follow the confirmation steps, including entering DELETE when requested.
If you have a subscription, cancel it through the billing store separately. Deleting your Mochi account does not cancel store billing.
The deletion flow provides a 30-day recovery period. Signing back in during that period lets you restore the account. Account recovery does not guarantee that every piece of content or previous work will be restored. After the period ends, the account cannot be recovered through that flow. Read the deletion screen carefully for what is removed and what remains.
If you want to keep your work, arrange any needed downloads or ask support about an export before confirming deletion.
If you cannot find the control, used a guest account, or cannot sign in, contact Support. If you already requested deletion and need help, say when you requested it. Do not create a replacement account to try to recover the old one.