In the stickyWhat tutorial?
Unless PIA has changed recently, you probably don't want to use their form of port forwarding. I've worked w/ it extensively, to the point I created scripts to manage it w/ dd-wrt, tomato, and even Merlin, and it's NOT for the faint of heart.
The problem is they require use of an API by the client to open a port of *their* choosing at *runtime*, which makes it difficult to configure your local port forwarding, and hence the need for a script to do so dynamically. And you only get *one* port. And only specific servers support port forwarding. And they've changed the API repeatedly, to the point my scripts no longer work, and I refuse to keep updating them.
It's just not a pretty picture, at least if you want to support it via the router. You're better off using a VPN provider who makes it simple, usually through some interface on their website where you can easily configure static ports of your choosing, and w/o all the restrictions.
Again, that was the situation the last time I used it, which was probably a couple years ago. Perhaps things have changed, but just be forewarned, and make sure to investigate before you get committed.
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