There's no way to get it connected to your Wi-Fi without a physical remote not to mention it's linked to someone else's Roku account. The only way to change that is to perform a factory reset and you absolutely need a physical remote once you do that. Many cheap universal remotes support Roku TVs and Roku has a simple TV remote for 10 bucks.
Roku TV Remote | Replacement Remote For Roku TV | Roku
How to factory reset your Roku® streaming device | Official Roku Support
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