You will need to head to the "Settings" menu.
When you input your phone number, you need to make sure that you input the number using the international format without any spaces or special characters, EG 1587647384.
You do not need to add the "+" symbol nor “00” when you enter your phone number.
Then click/tap "Update/Verify" and the system will send you a 6-digit code to your phone that you will need to input. If you do not recieve the code, you can resend the code.
Once you input the phone number, click/tap "Verify" and your number will update on our system.