Help with "Field editor" please

[wilsonyonex]

Have just downloaded latest patches and am having trouble with the field editor. The read me file hasn't quite helped enough. Having extracted the files and running the editor I can't seem to get the new fields into the gob file assuming that is where they go. Maybe I have things in incorrect folders?Cannot find answer by searching the forums and appears everybody else has cottoned on to what to do. Do the new fields replace the old ones or are they additional? Are they accessed from within the game or do I need to run a background programme. Have tried everything Ive tried before with patches but can't get this one to work.
Any help appreciated, and please I'm an old fella so not to technical.