Configuring Bridge AP//Installing SQM on Bridge AP

I have my openwrt router as a bridge ap connecting to my main router (modem/router provided by ISP) I can only access the openwrt luci gui by changing my ip address to but when I do this I lose internet access which then makes me incapable of updating package lists in order to install SQM. Also all devices connected through wifi or the lan on my bridge ap have an in address assign by my ISPs modem/router (192.168.0.x) my ps4 is connected to one of the lan ports of my openwrt router and everything works great but I was wondering If i wanted to forward ports for my ps4 would I do it on my main router or the openwrt router?