Have you found/read the right installation instructions? A simple search of SAS Support using the key words LSF and install should get you started. Be warned there are many versions of LSF and you need to locate the documentation specific to your version.
LSF 8.1 is mentioned on this page and if you read the 8.1 release notes it references the installation instructions in PDF form that should be included in your software download.
The SAS Users Group for Administrators (SUGA) is open to all SAS administrators and architects who install, update, manage or maintain a SAS deployment.