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Is there a reason you wouldn’t replace your main router with the Flint? That’s probably the better option unless you absolutely have to keep it.
A brute force approach would be to DMZ the Flint if your current router has an option for that. In any case, you’re looking for a port forwarding guide for your current router, not for the Flint. Otherwise yes, you’re going to want to go to your home router, find the Flint IP and forward the specific port you’re listening on to the Flint.
But again, simply replacing your main router with the Flint is probably what you want to do.