Error: Spatial Analyst License not enabled

Discussion created by mhross88 on Oct 26, 2011
EDIT: I figured out that I need to enable it in the extensions under customize, problem solved. Thanks.
I have a 6 month access to ArcGIS, and according to the ArcGIS Administrator I have the Spatial Analyst installed an authorized. I am trying to use HEC-GeoHMS but when I try to do anything it tells me that I need to "enable Spatial Analyst license and try again".

Does anyone know what I need to do? Thanks.