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The pdf file which you download consists of two pages.
The tri-fold is achieved by printing the first page (select on the pdf print dialogue, Print Range - current page). Then reload the printer, with the un-printed side of the sheet facing the print head. Move to the second page of the pdf, again select Print Range- current page, and print..
You will now have a double side document which you can fold to form your tri-fold document.
It is much easier to do than explain.
Obviously, if you prefer, these can be printed out as separate pages and used in this way.
The vertical guide lines on the description page of the walk are a guide to folding but will not be accurate as different printers give different lead in spacing.