YOU SAID:
I know that I signed up for this casually
INTO JAPANESE
私はこれに何気なくサインアップしたことを知っています
BACK INTO ENGLISH
I know I casually signed up for this
INTO JAPANESE
私は何気なくこれにサインアップしたことを知っています
BACK INTO ENGLISH
I know I casually signed up for this
That didn't even make that much sense in English.