Vogt he is trying to setup his macro keys on his g15, not trying to bind the keys.
I own the G15 but I don't use macros in DoD:S.
What Vogt is trying to say is open your console by pressing the ~ key, and once in console type the following: bind key "say *Salute*"
Just replace key with the key of your choice, I use p if that makes any difference.
If you haven't enabled the console, press escape, go to options, keyboard advanced options, and tick the "Enable Developer Console" box.