The information you need is in the Symantec Ghost Implementation Guide
If you cannot find the manual, you can get it from the Symwise knowledgebase - try this link:
http://www.symantec.com/business/support/index?pag...
You will see that I entered "Import License File" in the search field, and specified "Ghost Solution Suite" as the product. The manual is in the first two hits.
Check around Page 66 for information on how to obtain a license file and how to import it. I trust this will enable you to make further progress.
It may also be helpful for future searches to save a link to the Symwise KB on your system, as this is a relatively new feature of the Symantec website, and all information from Altiris and Symantec older KBs has been migrated into one large KB.