Help!!! Have posted my ad but can't make any changes

I have recently posted my ad and have made some errors but can't correct them- how do I do this?

I think you have to click on manage listing on the left side of your screen when logged in, and then edit from there....you will see a bunch of symbols representing description, time management etc....just click on those and you should be able to make changes....if that doesn't work maybe try contacting an admin for help :)