To use these skins, simply click on the Download link to download. The skin may have one of 2 installation types:
.zip file to the skins directory.
Depending on your Windows version, use one of the following paths:
C:/Program Files/Xfire/skins/SkinName.zipC:/ProgramData/Xfire/skins/SkinName.zipAfter the download has completed, restart Xf1re. The skin will then be installed.
Once you've installed the skin, go to the Tools Menu and choose your skin from the Skins sub-menu.
If you want to create your own skins, you'll need to do a bit (but not too much!) of reading. Start at the Xfire XML Skinning wiki