@Somerset1 

Archer VX1800v should support Easymesh according to its description and its user guide - here's a guide on how to do that.

Beware that Archer VX1800v may build an Easymesh only with a wireless backhaul, unless the ethernet backhaul feature has been implemented into the FW release that you already have installed:

Hello@polkmn55555 ,

According to the translation of Google Translate, your question you forget the wireless password of the modem. If there is any discrepancy, please describe it in English.

If you forgot the Wi-Fi password for the modem router.
    1. Check the bottom label of the router for the default Wi-Fi password, which is typically an 8-digit number.
    2. Open the Tether App, log into the router under Devices, and navigate to Tools > Wireless to view the Wi-Fi password.
    3. Connect your computer to the modem router via Ethernet, access tplinkmodem.net, and find the password under Advanced > Wireless > Wireless Settings.
    4. If all else fails, reset the modem router and use the default Wi-Fi password to reconnect. 
Note: A hard reset will revert the router to its factory settings without Internet access, requiring reconfiguration.