System not accepting the password for changing my email address

I have been trying for 2 days to change my account default email address. The system gets as far as me typing in the password sent to my current default email address. I then click on the submit button and nothing happens! This has happened 8 times now. After using Firefox as my browser for +-15years, I am very disappointed by the lack of access to a human voice. If I do not hear back from you I will change to Microsoft Edge as my browser.