WC3 Ladder games and port forwarding, help

Hi, i'm new to the server. I want to play same ladder games but i always get disconnected.
Now from my research i need to "port forwarding" to start playing
i saw some tutorials but i my modem is a
ARRIS
MODEL: TG2482A
The page say
If you can't find your exact router model in the list below then select one that seems similar. Most Arris routers have a similar interface. Finding a similar guide should work just fine for you.
¿Which should pick? Also, im playin from SouthAmerica, idk if that is a problem
Attachment 180622

See which one has the most similar interface as your router.

Also, we have introduced auto port forwarding function a few months ago, you can turn it on in the Warcraft tab. Tried it yet?