Open Settings, MyBiz Settings, General tab. You can edit your display name (the friendly name clients see), legal company name (used in contract and invoice headers), business email (a single address used for both billing and your public contact info on the bio page), tax ID, business address, default VAT rate, and currency.
Changes save when you tap the checkmark and propagate to everywhere those values are used — contract and invoice templates, automation email signatures, contact section on your bio page. The MyBiz Settings screen also holds Contact Info (phone, website, Instagram, Telegram, WhatsApp), Payments tab (Stripe, PayPal, Monobank credentials), and Integrations.