Go to Top-up -> Over-the-counter -> 7-Connect
Input your desired top-up amount and perform the required authorization.
Once you see a success screen, you will get a cash-in code. The cash-in code will be active for the next 1 hour after creation.
Show the reference code at your preferred 7-Eleven branch within 1 hour. Once you perform your deposit, the money will be added to your account.