The bank account used for withdrawing your funds needs to be in the same name as your MuchBetter account, and you are not able to change your name once you have set it. The same rule applies to other available withdrawal methods. If you withdraw funds this needs to be sent to the accounts in your own name.
Additionally, your account is protected by a passcode that you should share with no one. Depending on your phone model you can also enable biometrics in order to access your MuchBetter account