If you mean how do you edit AFTER it is written and posted you cannot edit them as Jaybay said. If you mean something else please let us know.
You can just post again right under the one you want to change, or add to and we'll understand it. I goof my posts too or don't communicate what I wanted to say. So don't hesitate to explain your question again....or re-ask it.
Hope this helps.
Hey grampy. So far, Med Help doesn't have an edit function. I sure wish they did!