YOU SAID:
Wait, I didn't sign up for that.
INTO JAPANESE
待って、私はそれにサインアップしなかった。
BACK INTO ENGLISH
Wait, I did not sign up for it.
INTO JAPANESE
待って、私はそれにサインアップしなかった。
BACK INTO ENGLISH
Wait, I did not sign up for it.
That didn't even make that much sense in English.