Hi Vân, First of all, you're currently posting in the English forum and there's no guarantee that we have a community member who might be able to speak your language who can assist you here. That said, I'll see if there's someone who can assist you in Vietnamese. In the meantime, you might want to update this thread with more information about your issue. Not being able to login is a general issue. Where are you trying to log in? Do you see any error messages you can share here?