Outline Journals configuration on all platforms.

Home.md

@@ -21,6 +21,8 @@ Windows 8.1.
 MacOS and Linux, and possible other platforms able to run a Python 3
 program, are supported by
 [running from source](https://github.com/EDCD/EDMarketConnector/wiki/Running-from-source).
+Once you have the application working using the information on that page 
+come back here for some configuration guidance.
 
 You can run the application on the same PC on which you're running
 Elite Dangerous or on another PC connected via a network share.
@@ -92,6 +94,48 @@ extra functionality.
 Start the application before entering the game to ensure that you don't miss any
 data.
 
+## Journals
+
+This application needs to know where your Game Journal files are in order to
+function.
+
+###  Windows
+On Windows these will always be in one standard location, because
+that's determined by where the game writes them.  It will always be:
+
+`Saved Games\Frontier Developments\Elite Dangerous`
+
+and this is the default.  To access this reliably in a File Explorer window use
+the path:
+
+`shell:SavedGames\Frontier Developments\Elite Dangerous\`
+
+*If you ever have a need to move `Saved Games` to another drive then you must
+do this via the `Properties` on its right-click menu, else neither the game nor
+this application will be able to find the new location.*
+
+### Linux
+If you're running the Game via Steam on Linux then your journal files should
+be located at:
+
+`~/.steam/steam/steamapps/compatdata/359320/pfx/drive_c/users/steamuser/Saved Games/Frontier Developments/Elite Dangerous`
+
+So set `Settings` > `Configuration` > `E:D journal file location` to point to 
+there.
+
+If you have file-shared the Game Journals from another machine that's 
+running the game and mounted them on your Linux machine then you will need to
+configure this to point to where you mounted them.
+
+### macOS
+It has not been possible to run the Game on macOS for many years now, so the
+only use of this Application is if you have file-shared the Game Journals and 
+mounted them on your macOS machine.
+
+Thus you will need to configure `Preferences` > `Configuration` > 
+`E:D journal file location` to point to where you have mounted them.
+
+
 ## Caveat on starting EDMC first
 However, *if your most recent game session didn't include you logging
 all the way into the game* then: