Added DE's and screenshots.

Added GNOME & MATE sections.  Added screenshots.  Changed background-section.jpg to show newer backgrounds.  Changed background-selection.png to a smaller jpg.
Typo


Quick Fix

configuration/changing-backgrounds/en.md

@@ -3,12 +3,48 @@ title = "Changing Background"
 +++
 # Changing Background
 
-You can change your background by going to the Budgie Menu, opening Settings, then clicking Background.
+Solus comes with a selection of backgrounds for you to choose from or you can use your own pictures.
+
+## Budgie
+
+To change the desktop background in Budgie, simply right click anywhere on the desktop and select "Change background".
+
+{{< altimg "budgie-background-right-click.jpg" "help-center/configuration/changing-backgrounds/" >}}
+
+Alternatively, you can open the Budgie Menu and then click "Background" in the System Settings category.
+
+You will have two options, Background and Lock Screen. Click "Background".
 
 {{< altimg "background-section.jpg" "help-center/configuration/changing-backgrounds/" >}}
 
-You will have two options, Background and Lock Screen. Select Background.
+In this section, you can choose between Solus wallpapers, pictures in your Pictures folder, or solid colors. After choosing, click "Select".
 
-In this section, you can choose between predefined wallpapers, pictures in your Pictures folder, or solid colors. After choosing, click Select.
+{{< altimg "background-selection.jpg" "help-center/configuration/changing-backgrounds/" >}}
 
-{{< altimg "background-selection.png" "help-center/configuration/changing-backgrounds/" >}}
+## GNOME
+
+The GNOME desktop background can be changed by simply right clicking anywhere on the desktop and selecting "Change background".
+
+{{< altimg "gnome-background-right-click.jpg" "help-center/configuration/changing-backgrounds/" >}}
+
+Alternatively, you can open the Applications Overlay by clicking the applications icon in the dock and then finding and clicking on "Background".
+
+You will have two options, Background and Lock Screen. Click "Background".
+
+{{< altimg "background-section.jpg" "help-center/configuration/changing-backgrounds/" >}}
+
+In this section, you can choose between Solus wallpapers, pictures in your Pictures folder, or solid colors. After choosing, click "Select".
+
+{{< altimg "background-selection.jpg" "help-center/configuration/changing-backgrounds/" >}}
+
+## MATE
+
+If you wish to change the MATE desktop background, simply right click anywhere on the desktop and select "Change Desktop Background".
+
+{{< altimg "mate-background-right-click.jpg" "help-center/configuration/changing-backgrounds/" >}}
+
+Alternatively, open the Brisk Menu and click on "Preferences" and then on "Appearance".  Click on the "Background" tab at the top if it isn't already selected.
+
+In this section, you can choose between Solus wallpapers, solid colors, gradients or using your own pictures by clicking "Add".  After choosing, click "Close".
+
+{{< altimg "mate-background-selection.jpg" "help-center/configuration/changing-backgrounds/" >}}