To change your personal details, log in to the XTB mobile app, click the profile icon in the upper left corner, and then select the Personal details tab.
You can also change your personal data in the Client office by choosing My profile tab -> Profile data.
If you cannot log in, please use the password reset option at the following link.
If, despite trying to refresh your password, you are not able to log in, you can also contact the customer service department to change your data (https://www.xtb.com/en/why-xtb/contact).
If you still need help with your question,
