Installed on Linksys WRT1900ACS

im noob with openwrt
i installed openwrt on Linksys WRT1900ACS router, remain setting will be default? or i should set something for get internet from the router? cause now seems it not have internet
below is how its configured:
all i want make this router vpn, mean provide in internet and get out openvpn connected internet
i knew i should install openvpn, but seems it not have internet and should i do some setting, right?


WAN and LAN subnets can't be the same, change the LAN subnet to something else than 192.168.1

in cli do

uci set network.lan.ipaddr=''
uci commit network
/etc/init.d/network restart