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The Admin Icons plugin can be installed in 3 easy steps:

1. Unzip "Admin Icons" archive and put all files into your "plugins" folder (/wp-content/plugins/) or to create a sub directory into the plugins folder (recommanded), like /wp-content/plugins/admin-icons/

2. Activate the plugin

3. Inside the Wordpress admin, go to Options > Admin Icons, choose your icon set, and save your preference.