Using internet by wifi and by cable simultaneously

Hello! I have a problem. On my router TP-Link WR1043ND I have installed firmware of OpenWRT ( OpenWrt 21.02.3 r16554-1d4dea6d4f / LuCI openwrt-21.02 branch git-22.083.69138-0a0ce2a). I read instruction and reassigned WAN on LAN port. But the main problem is - in instruction people use version of firmware, where in LAN-interface they can choose ethernet switch(eth0) and wireless(Wireless network master) simultaneously. So they can use after this internet by the connection to router by cable and by wi-fi. But in my version I can't have this possibility - only eth0 or Wireless. What can I do in this situation to use and wi-fi and ethernet connection both? image attach

Choose the 'br-lan' device here, then under the wireless interface settings, make sure network is set to 'lan'

This will assign both wired and wireless to the same bridge:

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