C6300

I JUST STARTED TO USE THE NETGEAR GENIE. I ADDED ADRESSES FOR PERMANENET MAC FILES. THAT WAS TO MOST SED DEVICES. I HAE A C6300 WITH THE HIGHES GRADE OF D/L CAPACITY FROM XFINITY. THEY ADDED AN ADDITIONAL NETGEAR ROUTER FOR MY HOME SECRITY. I ALSO HAE A RANGE EXTENDER FROM LINKSYS THAT PSHES 5G AND 3G SPEED WAVES. I HAVE A NEW SAMSUNG SMART TV. ITS IN A BED ROOM AROUND A WOODEN DRESSER. IT WILL CONNECT WITH  A 100FT ETHERNET CABLE ALTHOUGH IT WILL ONLY FIND MY NETWORK, EITHER OF THEM AND NOT CONNECT TO THE INTERNET. I WAS WONDERING  WHAT IS THE CORRECT TROBLE SHOOTING. DOES IT NEED A PORT FORWARD? OR WHAT CAN I DO WITH THE GENIE THAT MIGHT HELP. I CHANGED THE CHANNEL TO CHANNEL 11 AND GET BETTER ALL AROUND SIGNAL, WHAT DO YOU SUGGEST.