How do I use remote desktop over the internet not on the same network?

I've been using RDP over my home network, but I can't find any good tutorials on how to use it over the internet. I have a router, and firewalls. I know that I have to open a port or something through the firewall, but I don't know what I have to do to the router. I have a Dlink DIR-655. I also... show more I've been using RDP over my home network, but I can't find any good tutorials on how to use it over the internet. I have a router, and firewalls. I know that I have to open a port or something through the firewall, but I don't know what I have to do to the router. I have a Dlink DIR-655. I also don't know what to type in from the computer I would want to use to access my home computer from somewhere else. Can anybody help me?
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