I downloaded a standard price list utilized in the industry however, I am unable to edit same.

To edit a PDF file, you can use Adobe Acrobat XI. Or you can use Adobe ExportPDF to convert the PDF to an editable format (like Word).  You cannot edit PDF files with Workspaces (which is the forum you posted in).

Note that not all PDF files are editable - even with Acrobat or ExportPDF.