Comment: added playit tutorial

--- 19.md
+++ 18.md
@@ -33,6 +33,7 @@
 # If you *can't* port forward...
 You can use a service like [PortMap](http://portmap.io) (NOT PORTMAPPER) or [PlayIt](http://playit.gg)
 ## PlayIt
+https://www.youtube.com/watch?v=RfzqzQBSRnY
 1. Sign up for PlayIt, if you don't want to, use a Guest Account.
 2. Create a tunnel for a custom port, set the port to whatever you will host on. The default for ORRH (and most revivals) is 53640. *Make sure to tunnel UDP, not TCP!*
 3. Install the PlayIt app, then wait for it to request a code.