Keep getting isp routers gateway on client PC

Alright i followed the link.

I reset the openwrt router.
Then i made a second VLAN, and put PORT 4 in untagged.
Then i edited the br-lan interface to use "eth0.2"
Then when i went to my console and typed "ipconfig /renew" it said : "unable to contact your DHCP server. Request has timed out."

On another note, i am also quite confused on what my openwrt's gateway should be. Should it be my WAN ip or the isp router ipv4? so far i just left it unedited and just followed the link