Time to delete

I believe it is time for me to make a correction to a post I made. As I need to delete totally. What is the decent way of doing this? Is it just edit and delete or should I state a reason why? I want to be in line with the proper etiquette but I also want it to be done correctly. Can someone inform me on this?

no need to say why you delete unless you want to inform others of wrong information that was posted, Then you can just edit the post to say what is wrong is wrong. or just delete it if you feel that is best.
You can delete the whole post by clicking the trash can bottom right (you have to log in to do that) next to the reply button