Hi Betty,
Please refer the below links :
Convert from Word : http://helpx.adobe.com/content/help/en/acrobat/using/creating-pdfs-pdf maker-windows.html
Convert from Acrobat : http://help.adobe.com/en_US/acrobat/using/WS58a04a822e3e50102bd6151097 94195ff-7f75.w.html