Sonic.net

I installed a security camera system and I want to access my NVR remotely from my cell phone, I will need to create a port to access my NVR from the manufacturer DNS server which is Hik-connect.com, In the AT&T modem menu page it doesn't give me options to do that, Is anyone here with such setup can enlighten me please? Thanks

Never mind I found it in Firewall/Gaming tabs, I still couldn't get the port to report online availability I may have to use 3rd party router.