@Ft9293 

Hi, please share with us more details about the issue.

If you forget the wireless password of the MR200, please check if the default wireless password works or not, which is displayed on the product label.

If there is any client device that is already connected to the MR200, either via WiFi or via Ethernet cable, you could also login the web interface of the MR200 to check the current wireless password.

However, if both methods don't work, please reset the MR200 to factory defaults by holding the reset button for about 10s, then use the default wireless password to connect the TP-Link WiFi.