Currently Selenium IDE is only available as a Firefox plugin. You can download and install from here: http://openqa.org/selenium-ide/download.action
Once I downloaded the IDE and used it for some basic tests, I found the Selenium Reference (http://release.openqa.org/selenium-core/0.8.2/reference.html) to be very helpful, especially for a new user.
One thing that frustrated me is that at various points Selenium IDE generated:
selectWindow name=null
This does not work. Changing this (manually) to
selectWindow null
makes everything fine.
Once I downloaded the IDE and used it for some basic tests, I found the Selenium Reference (http://release.openqa.org/selenium-core/0.8.2/reference.html
) to be very helpful, especially for a new user.