To change the desktop background you can either type the path of the file you can type in Wallpaper image file or use browse to bring up a dialog to choose which the desktop. The drop down of wallpaper mode lets you change how the image you select for a wallpaper changes. If you want an image to have multiple copies of a smaller image select tile image from the drop down. If you do not want an image and just a solid color select fill with background color only.
The box labeled :guilabel:`select font` lets you choose which font and size information from a dialog box. On the left is a box for which font to select on on the bottom or type the name on top. The middle lets you choose the font style of the font on your desktop. On the far right is a choice for the size of your font which you can select from the menu. The box :guilabel:`select text color` brings up a widget to pick color of either the text color or the shadow color of the icons.
To launch desktop from the menu :menuselection:`Preferences --> LXQt settings --> Desktop`. Or from LXQt configuration center press the desktop button to launch it or run
