Short answer: No where. You don't longer need it.
Long answer: the organization key was an attempt from the LAMS Foundation to organize and better support organizations that were using LAMS. However, on the trials that we run with it, most people find it rather cumbersome to set this up and work around it. So we decided to drop it
From LAMS version 1.0.2, the installer will not longer ask you to enter and organization key.
If you are using the installer for version 1.0.1, just uncheck the "This will be an Online Server"
option. When this option is uncheck, the installer will not require you to provide an organisation key.
Posted by Ernie Ghiglione