This Guide is really short, because you have nothing to do, Toolbox will automatically identify the system and register it to your Mazda Toolbox user profile.
If you have followed the instructions of the "How to start using Mazda Toolbox?" Guide, and successfully connected your SD card and then logged in, then your system is already identified and registered into your Mazda Toolbox user profile.
If you previously added your system type on Mazda-NA.Naviextras.com site to your user profile, it is now overwritten by the automatic registration of Mazda Toolbox.