My TV is off-line and my Roku remote does not work anymore. and since my TV and roku have no connection I can’t find it on the app nor connect to it
You pretty much need a remote to do anything if your TV isn't connected to your network. The Roku voice remotes work with Roku TVs, but none of the others do. You need a remote for the TV's manufacturer (e.g., TCL, Hisense, onn, etc). Many universal remotes will work if they support Roku TVs and not just Roku devices.
There is a known problem with Roku devices and some routers supplied by ISPs, so if you've been connected to a 2.4GHz Wi-Fi channel you first want to ensure that your ISP didn't disable it in your router and then make sure it's set up for wireless mode b/g/n and not g/n.
@Jessymullenix, you made it sound like you had a Roku TV, not a Roku device connected to a TV. The model number written on it would help, but most Express models can only connect to 2.4GHz Wi-Fi, so everything I said about that applies.
My remote went out a few months ago,so I have been using cell phone app as roku remote. However now I am living in a diff place and I have no way of using my phone app remote to switch to a diff wifi sine my roku is connected to old wifi