If you will use eXtreme Styles mod for phpBB then you'll see some additional small interface enchancements for all my themes and forum will run faster. But this mod isn't required - themes will run perfectly without it same way as all other themes do.
Unzip archive in directory "templates". Make sure you uploaded all template files.
When uploading files on server make sure that you do not mix filename case so style is uploaded to templates/Iris/, not templates/iris/
Login on forum as administrator.
Go to Administration Panel (link should be on bottom of forum page).
Click on "Styles Admin", then click "Add".
You should see list of available styles. Click on "install" on style that you want to install. If uploaded style isn't there then you must have uploaded it incorrectly.
If you want to change main forum style click on "General Admin" -> "Configuration", select style in "Default Style", if you want all users to use that style then select "Yes" in "Override user style" and click "Submit".
Note: if you are using phpBB 2.0.4 or older version better update to latest phpBB or you might experience some problems with this style.
Note: if you have some phpbb mods installed on your forum that require to edit tpl files make sure you edit all styles, not only subSilver.
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