port fowarding on ptcl dsl an1020-16t - YouTube
Follow this video then. You must know which ports you want to open and whether for TCP or UDP (its usually given in port instructions on game site etc, along with which ports to open).
I have the same router and have opened ports same way.
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BTW, if you have your PC attached to a router which is attached to THIS Fiberhome router, then ports will never be forwarded. Your PC needs to be connected (either via WIFI or via Ethernet wire) to THIS Fiberhome router only, not to any other router.