i need help with portforward

ive been trying to forward my goddamn ports but nothing seems to work. ive looked at a thousand tutorials and i follow everything that they do but nothing helps. i get this error msg on the software i use whenever i try to set it up and it says that “this ip is not something or this port is not open” i think my wan ip is private is that has anything to do with it but yeah, if anyone can help me that would be great