Hi Lyle,
We're sorry to hear that you find difficulty with this process.
You're able to edit your account details under "Profile" and then "Settings" on the Luno App. Should you wish to update your email address or mobile number, you may be redirected to the Luno website to do so. We do this to ensure the security of your account, as the safety of your account is of utmost importance to us.
If you're experiencing any trouble with updating your information, or have any questions about this, feel free to reach out to our support team here -
https://www.luno.com/help/en/tickets/new?category_id=30We will gladly help.