Once you have the core phpGroupWare install up and running, you may want to download and install additional applications.
You should consult any README or INSTALL files that come with the new application first, as most require you to create additional tables in the database, and add additional translation data to the lang table (typically a file called lang.sql)
You install the new application within the phpGroupWare install tree by copying the application directory into the phpGroupWare install location, and enabling the application through the Administration page.
For example, this is the process to install the Headlines application (see http://sourceforge.net/phpgwapps/ for more on this and other applications).
Download the .tar.gz file for the application, or check out the source with cvs with
export CVSROOT=':pserver:anonymous@cvs.phpgroupware.sourceforge.net:/cvsroot/phpgwapps'
cvs login (just hit enter if prompted for a password)
cvs co headlines
Move the headlines directory into your phpGroupWare install directory.
Log into phpGroupWare as an administrative user, and go to the Administration page.
In the first section, choose the Applications link.
Click on add, and fill in the form.
Application name should be identical to the name of the directory you moved into the phpGroupWare install, in this case use headlines
Application Title is shown in the navigation bar and other places to refer to the new application. Enter Headlines for this example.
Enabled can be used to disable an application for all users temporially. You should normal check the box to enable the application.
Back in the Administration page, you need to enable the application for specific users or user groups by editing them, and checking the new Headlines box that appears in the middle of the account editing page.
Once you have added the Headlines app to your account, you should see a Headlines entry in the Administration and Preferences pages, and there should be an icon for the Headlines application in the navigation bar.
Once you enable a few of the Headlines sites through the Administration page link, you should see headlines grabbed from the sites you selected when you click on the Headlines icon in the navigation bar.