"Nie znasz swojego hasła?"
Translation:Do you not know your password?
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"twojego" would be technically correct, but kinda clumsy. If a form of 'swój' is correct in a given sentence, you should use it rather than the 'normal' possessive.
Yes, "I forgot my password" would be "Zapomniałem/Zapomniałam swojego hasła". "swój" always refers to the subject of the sentence.