Not to sure about the link, But post is easy print it out put in an envelope lick and stick, put a stamp on the front address it then put it in one of the red things normally on the corner or at the post office
Not sure I only used them when I had me bike good in the helmet whilst riding, can't find them at the mo, when I get another bike I'm gonna get some more and I'll put a tele on the handlebars and let you know