Port forwading on a Belkin router

I am a new owner of a Tablo, I am trying to do a port forwarding to a Belkin router about 3 years old, it need to do a manual port forwarding, but I haven’t been able to figure it out. When I contacted Belkin support, they weren’t too helpful. Model # F9K1105V2. Has anyone been able to do this?
If I can’t do port forwarding, what routers are you using that is easy to do connect remotely (Tablo connect) ?

It looks straight forward on the link below.

What is the make and model of your ISP modem? Is it just a modem? Or does it have a built in router function too?

https://www.belkin.com/us/support-article?articleNum=10790

Login to the router home page, then click on Advanced Settings, then look under Firewall and click on “Port Forwarding”.

http://cache-www.belkin.com/support/dl/MAN_F9K1105v2_8820-01313%20_RevA00_N450_Router.pdf?_ga=2.128431180.1174406781.1538157566-368490898.1538157566

I purchased a newer Belkin (AC1200) router to replace an older Belkin. The new one was fast and worked great but I could never get it to cooperate with Tablo. I even worked with Tablo support. The older one was just too old and started to struggle with everything. I finally replaced them with a Netgear R6400 and it’s been smooth sailing since.

If you are trying to manually setup port forwarding make sure UPnP is turned off. If it has UPnP.