That's not a problem. Can you post your settings? Without knowing what your setup is, my first question is, do you have the wireless interface and the LAN interface in a bridge together?
If you routing is working for you what you are asking for is how to connect the wireless, then you will want to create a new bridge with the LAN and the wireless ports. Then everywhere in your config that you have something attached to the LAN port, change it to the bridge. For example, IP addresses, mangle rules, DHCP server, NAT, ect.