YOU SAID:
I am not the acting president.
INTO JAPANESE
私は演技大統領ではない。
BACK INTO ENGLISH
I am not acting president.
INTO JAPANESE
私は大統領を辞任していない。
BACK INTO ENGLISH
I have not resigned from the president.
INTO JAPANESE
私は大統領から辞任していない。
BACK INTO ENGLISH
I have not resigned from the president.
That didn't even make that much sense in English.