there is normally a cross next to the comment, if u can't see it then put your mouse over the top right corner of the comment box and there should be a cross.
When you hover over the post with your mouse on the right hand side of the post there should be a little button saying remove just click on that and you will be able to delete the post.
When you mouse over the comment and go to the upper left hand corner of your comment a little x should appear. Click it. Hope this was helpful!! :) :) :)