To install Selenium means to set up a project in a development so you can write a program using Selenium. How you do this depends on your programming language and your development environment.
The easiest way to set up a Selenium 2.0 Java project is to use Maven. Maven will download the java bindings (the Selenium 2.0 java client library) and all its dependencies, and will create the project for you, using a maven pom.xml (project configuration) file. Once you’ve done this, you can import the maven project into your preferred IDE, IntelliJ IDEA or Eclipse.
First, create a folder to contain your Selenium project files. Then, to use Maven, you need a pom.xml file. This can be created with a text editor.
As of Selenium 2.2.0, the C# bindings are distributed as a set of signed dlls along with other dependency dlls. Prior to 2.2.0, all Selenium dll’s were unsigned.
If you are using Python for test automation then you probably are already familiar with developing in Python.