Hello Dayco,
The video you watch from Gary Fox was produced using Linux which the Home directory is the primary user directory.
Under windows your home directory would be the C:\ drive you can try using C:/Documents/Part Library or something like that. If that does not work the default location for the library file is
C:\Program Files\LibreCAD\resources\library
If you want to leave it on the default location create your directory folders for the blocks under C:\Program Files\LibreCAD\resources\library\Electrical symbols .... etc
I hope this helps you out.
I use Mac so I had to remember the directory structure of Windows....LOL
When you have the will to always learn there is nothing that is impossible....The day you stop learning is the day you need to change your profession.