The information in this wiki hasn't been maintained for a good while. Some of the projects described have since been deprecated.
In particular, the "Ushahidi Platform v3.x" section contains information that is often misleading. Many details about this version of Platform have changed since.
This website is an extraction of the original Ushahidi wiki into a static form. Because of that, functions like logging in, commenting or searching will not work.
For more documentation, please refer to https://docs.ushahidi.com
You configure Ushahidi v2.X through four tabs (addons, settings, manage and users) on the administration dashboard, http://www.example.com/admin, where example.com is the URL of your Ushahidi deployment.
If you want to make changes to Ushahidi v2.X that aren't in these tabs, you should also check out the Ushahidi v2.X developer guide.
There's more information in the Ushahidi manual prepared by Anahi.