How to put a picture on pricate using mobile version of FaceBook? (iPhone app)?

I have put tons of pictures on private, but for some reason it won't let me. I click on the "…" and these are the only options I get, none of which are to change the privacy. Help? How to put a picture on pricate using mobile version of FaceBook iPhone app

I Don't Think Its Possible Using The App You May Have To Use The PC Site On Your Iphone Or Use The Computer To Change It