You can go that answer, there will be an "edit" button, if you are logged in. If you are not logged in, you have to, in order to edit it. There you can make whatever changes you want and submit again.
The answer cannot be deleted, as Timmappa said, but can be edited and re-submitted. If you were already allotted some points or CC, that would be cancelled and it would go to the "new submission" status and would be reviewed again.
For further queries, you can continue in this thread itself, but it would be better if you elaborate on the issue in the Post Description following the same "editing" method which I suggested above.