I can no longer change the password on my Arris SBR1900AC. 

I can change the username, but not the password. See screenshot attached.  

In the “Change Password” Dialog, there is no field to “Enter New Password”

I’m on a Mac Pro, Early 2009, running 10.15.17, and Safari 15.6.1.

The Mac is connected to the router via ethernet.

Haven’t had any issues until recently. 

Any help much appreciated