WordPress.org

1. Unpack the download-package
2. Upload folder include all files to the /wp-content/plugins/ directory. The final directory tree should look like /wp-content/plugins/adminimize/adminimize.php, /wp-content/plugins/adminimize/adminimize_page.php, /wp-content/plugins/adminimize/css/ and /wp-content/plugins/adminimize/languages
3. Activate the plugin through the Plugins menu in WordPress
4. Selecting Colour Scheme and Theme, selection in Your Profile, go to your User Profile (under Users > Your Profile or by clicking on your name at the top right corner of the administration panel).
5. Administrator can go to Options > Adminimize menu and configure the plugin (Menu, Submenu, Metaboxes, ...)

Advice

Please use the Deinstall-Function in the option-area before update to version 1.4! Version 1.4 and higher have only one database entry and the Deinstall-Option deinstall the old entrys.

See on the official website.