How to enable your privacy settings?

I'm not sure if I'm asking this quite correctly, so let me explain further. I have an IPhone 4s. If I were to go to settings, then go to the "Privacy" part, and then under that "Photos", I can't do anything. I can't switch to "on" or "off" it would not let me. I'm not exactly sure if I'm explaining this correctly at all, but if you do understand what I'm saying, then please answer me question. I can't post photos at all, like on instagram, facebook etc. And if I were to go to settings, and then try to turn on photo privacy I can't.

I don't know