Nighthawk R8000 Port forwarding not working

> Nighthawk R8000 [...]

   Firmware version?

> [...] Port forwarding not working

   What kind of "not working" is this?  "not working" is not a useful
problem description.  It does not say what you did.  It does not say
what happened when you did it.  As usual, showing actual actions with
their actual results (error messages, LED indicators, ...) can be more
helpful than vague descriptions or interpretations.

> Nighthawk R8000 port forwarding after days of attempting different
> methods.

   The non-psychics in your audience may have no idea what those
"different methods" might have been.

> I have created a Fivem server on my computer, [...]

   This?:

      https://fivem.net/

> [...] I have followed all the tutorials ive found [...]

   I have no idea what any of those might be, or what you read/watched,
or what you did after you read/watched them, or what happened when you
did whatever you did.

> [...] and scavenged the fourms pages looking for other peoples
> solutions, [...]

   Can't see/guess what you found there, either.

   Which ports do you want to forward?  Where did you get that
information?

   What's the LAN IP address of your (unspecified) "my computer"?  What
have you done to ensure that it stays at that address?

   What's between your R8000 and your ISP?  (Some modem, or some
modem+router, or what?)

   What are your (proposed?) port-forwarding rules?  Copy+paste is your
friend.

   The usual problems with this stuff are:

   1. Wrong external IP address (different from the port-forwarding
router's WAN/Internet IP address).  (An intermediate NAT router, for
example, could cause this.)

   2. Bad port-forwarding rule (wrong port(s), wrong target address --
including a wandering target).

   3. Server not listening on the port-forwarding target system.

   4. External influences: ISP blocking, other firewalls, ...

> [...] Im no expert when it comes to networking [...]

   The less you know, the more important accurate, detailed descriptions
become.

> [...] I can upload more screen shot [...]

   In-line images in these forums must wait for moderator approval, so I
can't see yours yet.  (An attached file incurs no such delay.)  Some
little description would be nice, even if the pictures were visible.
Copy+paste is your friend.