How to create embed for my website

I have a website with old games and I want to create an embed button so I can share it with other people, but I have no idea where to start. I searched for info online but nothing. I can create an iframe, but I cannot press any button on the keyboard when the game is embedded on another website.

that’s an example:

https://casinoslotz.net/test.php embedded website, but can’t play

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