I cannot reply to a craigslist ad.  I had no problem with internet browser.

I can open the craigslist ads and look at all the information and also the pictures. 

When I click on "Reply" nothing happens.

I looked at one suggestion from craigslist and it says to go to preferences and uncheck the "private Browsing" box.

I have checked all over and can find the preferences but can not find the Private Browsing box.

Thank you