Port Forwarding without static IPs?

So I'm reading that we cannot as residentially create a static IP for our devices?

This is not a STATIC PUBLIC IP FYI!

Devices being listed as static and manually setting the IP, so my question is about port forwarding, how then am I supposed to set a rule and have it target a device indefinitely? 

MY issue is that I have a NAS and security cameras that I'm trying to link, but I need to forward the ports.  Please assist!

I need to also make my NAS and camera Static and not DHCP. I have read there is a way to make them as a reserved IP, but I do not see that in the app and as is they do not communicate to one another due to network setup.(Not Plug N Play) Please assist, when able.