Login to the site using your username and password. Go to "Manage profile" box at the right and press "View my profile".Scroll down the page to see a comment at the bottom. Click "Delete" next to the unwanted comment to remove it from your page.
What type of person you want to talk/chat?! Do you unfriend/blocked immediately the person you talk/chat when she/he missed to answer your message? Are you understanding person when someone tell her/his reason why he/she can't reply asap in your message?
You have to be understanding or else things won't go as planned. I speak from experience because of what I do for a living (Public Safety). I had a lady on here who couldn't understand that in my line of work, I can't always answer as quickly as I would like and she really upset with me and blocked me. When you're driving an ambulance from point A to Point B You can't talk and text. Sometimes it takes 3-4 hours before I can respond.