To log into the Linksys Velop setup portal, you can either use the web interface or the WiFi app. These two portals will provide you access to the same features for your ax4200 Velop. But, you will need to use the Velop default login credentials which include the username and password. For the first method, search for the Linksys default web or IP address. Whereas, for the second method, install the Linksys WiFi app on your smartphone either on Android or iOS. After that, enter the login credentials in the prompted fields on the window and move further to the Linksys Velop ax4200 setup portal.