Register and activate licenses in Palo Alto firewall

Register the Firewall

STEP 1 Log in to the web interface of the firewall (https://<IP address>)
STEP 2 copy serial number of device from the General Information section of the Dashboard screen

STEP 3 Go to https://support.paloaltonetworks.com
STEP 4 Register and verify the email 

Note : To register, you must provide your sales order number or customer ID, and the serial number of your firewall (which you can paste from your clipboard) or the authorization code you received with your order. You will also be prompted to set up a username and password for access to the Palo Alto Networks support community.
STEP 5 : Once email is verified,login to https://support.paloaltonetworks.com using the email address and password
STEP 6 : You will be prompted to choose two security questions and answers to use if you forget the password.
STEP 7 : Register new device by going to Asset tab > Devices > Register new device and fill the details needed

Activate Licenses and Subscriptions

STEP 1 : Locate the activation codes for the licenses you purchased from the registered email address you have provided while purchasing device.If you cannot locate this email, contact customer support to obtain your activation codes before you proceed.
STEP 2 : Launch the web interface and go to Device > Licenses
STEP 3 : Activate each license you purchased either by following method
Retrieve license keys from license server —Use this option if you activated your license on the support portal. 

Activate feature using authorization code —Use this option to enable purchased subscriptions using an authorization code for licenses that have not been previously activated on the support portal. When prompted, enter the Authorization Code and then click OK.

Manually upload license key —Use this option if your device does not connected to internet. In this case, you must download a license key file from the support site on an Internet connected computer and then upload to the device.
STEP 4 : Verify that the license was successfully activated from Device > Licenses .You can see the issue and expiry date of the licenses here once its activated
STEP 5 : (WildFire subscriptions only) Perform a commit to complete WildFire subscription activation.