Once you have the PAN-DB URL License you'll simply need to run 'set system setting url-database paloaltonetworks' and commit and you should be ready to go.
I might advise running 'clear url-cache all' once that's been finished just to clear out all of the brightcloud URL listings from your cache. This really wouldn't matter one way or another however, and it's possible that the change does this automatically as is.
You'll first need to get aURL4 license through your normal sales channel, and then follow the 2 easy steps as @BPry mentions
you'll need to spend a little time afterward going over your URL security profiles as categories will have changed and some settings may no longer reflect your preferred policy (eg. command and control does not exist in brightcloud, you'll want to make sure all the new categories are set to optimal actions)
As a renewal they will be able to switch you to pandb automatically, but if you want to start the license right away, this will be a new contract
You could try reaching out to your local sales team so they can get involved: https://www.paloaltonetworks.com/company/about-us/locations
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