How can I check for duplicate records when the Next button does not work?

I need to check my database for duplicate records. But when I go through the process, when the first NEXT button occurs, it does not work. I click on the button and nothing happens. It worked 2 days ago. But now, clearing the cache, restarting Chrome, & rebooting the Mac did not fix the problem. It will not go to the next screen

How can I get this to work? There is no chat available anymore. I just want to fix this now and not have to wait for ver. I need to check for and merge all duplicates