You can’t change the primary email you use with your Olo account. The primary email is set up when you create your Olo account.
If you want to change your primary email address, you need to create a new Olo account with a new primary email and delete your existing account. Create a new Olo account by signing up at any Olo-powered restaurant brand. If you’re unsure which brands use Olo, simply create a new account at the restaurant brand you previously ordered from.