On facebook How do i let an app post on my status again?

About 6 months ago i didnt know how to use privacy features . i use to go in manually and delete game postings on my wall. eventually a pop up came up and said do you want fb to ask you for now on when this app posts on my wall and i clicked okay. now i get a pop up every time i want ot publish. how to i get it back to auto publish again? :)