For your Linksys Velop mx4200 setup, the web interface can help you a lot by providing the features. All you need to do is visit the setup portal on any web browser of the networked device such as a computer, laptop, or tablet. So, once you make the Velop ready for configuration, access the setup window using the default web/IP address of Linksys. When you reach there, you will see a dashboard asking you for the username and password. Here if it is your first time login, then create a new password from the window and enter the Recovery key in the field. Then, click on the Connectivity option under the CA link and then on the CA router setup. Now, create a new WiFi SSID name and password and click on the Setup Node option. Soon, you will get the flashlight on the parent node which ensures that the setup is complete.