I’m using no-ip.org with home assistant. You need to set up your router to do two things:
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Automatically update no-ip.org with your router’s outside IP (most of the modern routers have a section for setting up dynamic dns, but as every one of them is different you’ll have to check your manual)
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Port forward port 443 to port 8123 (this is actually mentioned in the video that @ih8gates referenced above). NOTE: this is assuming that you have set up SSL. If you haven’t, then do that first please. You don’t want to expose your HA instance to the outside world without doing that first!