Open your WHM by typing http://you.cpanel.whm.host:2086/
Log in as server administrator.
Click "Install cPAddons" in "cPanel" section. You'll see "cPAddon Scripts Installer/Updater", which allows you to add/delete cPAddons.
Scroll down to "Add/Remove Vendors" section and type the following URL in "Vendor's information URL" textbox: http://www.afterlogic.com/cpanel/cpaddons/
Click "Update Vendors" button. After that, you'll see "AfterLogic" in the list of available Vendors and WebMail Lite PHP in the list of available cPAddons.
Check WebMail Lite PHP and click "Update Addon Config" button. Once the installation procedure is done, WebMail Lite PHP will appear in the list of installed addons.
Now, domain administrators of your server will be able to install WebMail Lite PHP from cPanel for their domains.
Open your cPanel by typing http://you.cpanel.whm.host:2082/
Log in as domain administrator.
Click on "Site Software" in "Software/Services" section. You'll see the list of cPAddons available for installing on your domain. In Email Section, "WebMail Lite PHP" should be available for installation if the server administrator has installed it for you.
Click on WebMail Lite PHP cPAddon and you'll get to the installation screen.
Specify installation URL - URL under which you want to get WebMail Lite PHP accessible on your domain, and click "Install".
After installation procedure you'll get congratulations screen and full URL for accessing your instance of WebMail Lite PHP.
To access AdminPanel, type the URL of AfterLogic WebMail and add /adminpanel. For instance:
http://www.mydomain.com:2095/wm/adminpanel/
Now, you can use Admin Panel to create domains, users, configure mail server and start using WebMail Lite PHP. Please note, however, that WebMail Lite PHP is not a mail server but a mail client, and users and domains you create in WebMail Lite PHP should correspond to users and domains already existing on your mail server.