Can not post to want ads

Why can't I post to the want ads. I keep getting a pop up "insufficient privileges". How do I overcome this problem?


And another question. What does the green OP beside a username indicate?

 

If you're using a phone or tablet you can't post to the classifieds using the mobile app. Try using your phone's browser or a PC or laptop.

 

I've never seen a "green OP" while using a browser and desktop in Windows. Or is that something that only appears in the app?

 

The green OP indicates Original Poster, or the author of a given post.

...thank you.