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What experience do you have? Without a significant level of experience you won't be able to.
Does it have any video or antenna input connections?
Like the one coming with the ZX81 Timex Sinclair?If you look on ebay or back at goodwill for a 80s computer they often have a modulator in them, the video o/p is then an rf signal, you could take one of these out of such a computer and with a suitable power supply convert a video signal say from a scart socket into an rf signal suitable for the tv.
No real electronics involved but there is a fair bit of soldering and fiddling.