How I install in ASA 5520 ssl vpn license.I by ASA5500-SSl-50 and cisco send me the key authorization but i d'ont know how to install itthinks

Wen I want to connect to the media server with from outside the CPU of my PIX up 80% and the traffic in interface DMZ goes to 29000 Kbpsb (the microsft media server is in the dmz interface). the connection fron inside work fine.With the version 6.34 ...