try this one (hope it helps)

I succeded removing the second msg, but not the first ( I believe you must remove your message before I'll be able to do so ).

Thanks for the guide.

you can delete your own post by,

clicking "edit" button of this post which is located on right hand side of this message , you will have a Delete checkbox on middle top of the same message after clicking edit button and check that hit the "Delete Now" button. which will delete your own post.

after you will delete , I will also delete this mesage. just to let you know.

thanks
Paresh