Product Registration Page and login with your TAC credentials. In the Product Authorization Key (PAK) field enter the Product Authorization Key from your PDF then click submit.
After submitting the required information and verifying other info you'll see the following message indicating that you'll have to wait up to one hour to receive an email with the xxx. You'd think Cisco would be able to provide this info right away. Guess not.
You'll be presented with the following helpful message to read while you wait...
Your license and user information will be sent via email within 1 hour to the email address you specified. If you have not received an email within 1 hour, please open a Service Request using the TAC Service Request Tool. Please have your valid Cisco.com user Id and password available. As an alternative, you may also call our main Technical Assistance Center at 800-553-2447.Fortunately only a few minutes later I received the email with the ASA activation key (which is 77 characters long) and the following instructions.
Please be sure to check your Junk/Spam email folders for this email from firstname.lastname@example.org with your license key attached.
Installing Your Cisco Adaptive Security Appliance Activation KeyWhich I promptly followed. Now I have 10 licenses with which to connect my clients. This by the way is a bit of a disappointment as I already had two. I would have hoped Cisco would have preserved the two gratis WebVPN licenses and added my 10 new ones. Not so luck.
Step 1. From the command line interface (CLI), enter configuration mode using the "conf t" command.
Step 2. Type the "activation-key" command, and then, when prompted, enter the new activation key listed above.