You can always make changes to your contact information, including updating your phone number. Here are the steps you should follow:
Tap on the icon (person) located at the top of the screen. This icon represents the main settings menu of your app.
Next, select the "Profile details" tab.
Tap on the "Edit" icon next to your previously entered phone number.
Enter the new phone number and tap on "Continue."
Follow the SMS verification process to confirm the changes.
By following these steps, you will be able to update your phone number by entering the new number and completing the SMS verification process.
Kindly note, that after changing of your phone number you won't be able to trade or to make any withdrawals from your account during next 24 hours due to security reasons.