Editing titles

In one of my databases I gather all the research related PDF files. I am using the three pane view and I have enabled author and title columns. The information in these columns are extracted from PDF documents and are not usually correct. I have been trying to find a way of editing this information to enter the correct information, but I have not been able to do it. Is there any way to edit the info in these columns?

Thanks.

Tools menu, “Show Properties”. Not every field is editable for PDF documents, and some document types do not support any of the properties fields.

Thank you very much.