If you can't recall your old WiFi SSID and password, then the only way to connect your TV is with a remote. I'm assuming the TV doesn't have an Ethernet jack or you can't run a cable from your router.
Since it's a Roku TV, you should still be able to get an inexpensive generic IR remote from almost anywhere that sells remotes and other electronics. Check your TV brand (Roku didn't make your TV, they just started doing that themselves very recently) and make sure any generic remote lists your brand as supported. They also might list Roku TVs separately, but the TV remotes aren't the same as the player remotes, so just because they say Roku doesn't mean it will work on a Roku TV.
But the odds are you can find one for very little money. One of our local stores has multiple generic IR remotes between $6 and $20.
Dan
Roku Community Streaming Expert
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