Log into your MR40 portal. (The IP address is found on the bottom, but is usually 192.168.1.1)
Once logged in on the left side of the screen, you will see a dropdown menu. Select Network.
Next, select the Wireless option.
This will pull up the wireless overview. Select edit in the 2nd row.
You should be on the general setup tab. Click to go over to wireless security.
You will see something that says key. That is your old password. You can delete that and replace it with the new password.
After Entering the new Wi-Fi Password, click save.
Click Save & Apply at the bottom of the screen and wait for the change to go through.
After that, your Wi-Fi password will have changed.
