Sorry, there's no way around getting a physical remote. If you tell us what model number is written on it we can tell you if you can get away with a cheap universal remote, whether you need a proprietary Roku remove, or whether it's pretty much obsolete and and not worth getting a remote.
What kind of remote did you get with it? If there's a microphone button on the remote or a little button on the back or inside the battery compartment then the remote has to be paired before it will work.
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