To change your password, you have two possibilities:
Possibility 1: On the login page, you just have to click on “Forgotten password”. You will automatically receive an SMS on your number containing an OTP code that will allow you to proceed to the next page and enter a new password
Possibility 2: in the settings of your account, you will see explicitly “Change password”, you will be asked for your PIN code, then enter the old password, enter the new password and validate.