Really just a few basic steps, you'll probably learn in the process, as port forwarding will work the same for whatever you need to forward.
*If you don't wanna forward ports, you can put the device in the DMZ (demilitarized zone) in the router config. This will put it outside the routers built in NAT/firewall config. But, be warned, ALL ports are allowed and it's considered a vulnerability that most people won't accept
Ok, onto the steps...
Step 1 - figure out what the INTERNAL IP is for the device in the network. Either look at the devices settings or find it in the router client lease.
This is also a point where you will want to set a STATIC DHCP IP for that specific device (and outside the DHCP pool addresses). You'll do this is the router, somewhere in the config pages. This is a good step to ensure 1) the router always gives this device the same IP 2) no static config required on the device
Once you do this, reboot the device a few times and check it's IP config to ensure its getting the IP you configed the router to give it.
Once you're confident this is working ok, move on...
Step 2 - Configuring the rule. As you can see in the second pic, there's a few options. In this case, the LOCAL IP is the IP you configured in step 1. The rest is as simple as configuring the internal and external ports, either individually, or as ranges. In this case, the Internal/external ports should match.
*Much of this is searchable on the web.
** If you don't do Step 1, and the device gets a different IP, then you will need to edit your rules and change the local IP to the new IP lease.