YOU SAID:
I do not know what to write to mess up this thing
INTO JAPANESE
私はこのことをめちゃくちゃにするために何を書くべきかわからない
BACK INTO ENGLISH
I do not know what to write to get this messed up
INTO JAPANESE
私はこれをめちゃくちゃにするために何を書くべきかわからない
BACK INTO ENGLISH
I do not know what to write to get this messed up
You've done this before, haven't you.