Why can't I edit my restaurant name myself?

The restaurant name is changed by the support team — ask from Help & Support.

Your restaurant name is displayed to customers on your public pages and in your emails, so changing it is deliberately not self-service — the field on Settings → Venue → Restaurant profile is shown read-only. To change it, click the contact our support team link next to the field (or go to Help & Support) and start a conversation with the new name you'd like; the support team makes the change for you. All your other contact details — phone, email, address and website — you can edit yourself on the same page.

Related: How do I change my restaurant's contact details?