Cannot connect internet to TV.

Yesterday I was on Twitter with a Cox rep. Person indicated my network correction was incorrect, had a previous cable company, Network showed ATT....She stated she was going to reset my modem, never did. Another person said possibly my TV didn't like the password, which was ridiculous, & stated to contact Samsung.. Cox is responsible for the network settings to connect Wi-Fi throughout my home. I am able to watch TV, use my internet. I am just trying to connect my internet to my smart TV to browse the web and read email on my TV. Cox was installed 2 weeks ago and I gave my network name and password to the installer. This password will not work on my network TV , possibly because the network name is incorrect. I want to know if I will lose everything if I reset my password. I believe the network also has to be changed, but I do don't want to do it for fear of losing all my connections throughout my wifi home. I have a Samsung Smart TV, LED. The modem is a panoramic. Hopefully someone can help me, as this has been going on for over a week and I have spoke with Cox on the phone for hours, only to be disconnected and no help. I was on Twitter. Please can someone help me. Thank you