Email Templates
The sign-in email is the email a member gets after entering their email on your login page. You can change its text under Email Templates in your site dashboard.
The sign-in code
Every sign-in email sent from your login page includes a 6-digit code below the sign-in button, and the code ends the subject line, for example "Your login link for Acme (code 123456)". On most phones the code shows in the notification.
The code is always included, even if you changed the email's text, and you can't edit or remove it.
Two emails carry only the link: sign-in links you send from the Members page, and the email a member gets after paying for access with Paid (Stripe).
How long a code works, and its limits, are on the Member Login Page.
More about editing your emails is coming soon.