I'll make sure you'll be able to edit your employee email address in QuickBooks Online.
It's possible this might be caused by a corrupted file cache stored in your browser, that's why your unable to edit your employee email address.
We can do some troubleshooting steps to rule this out. Let's open your QuickBooks Online account in an incognito or private browser. This mode will not save your browsing history and will also help isolate any web issues.
Here are the keyboard shortcuts:
Google Chrome: Ctrl + Shift + N
Mozilla Firefox: Ctrl + Shift + P
Safari: Command + Shift + N
If it works, you can clear the cache to delete the history or log files so you can start with a clean slate. Alternatively, you can use different supported browsers to further isolate.
In addition, QuickBooks Online provides several payroll reports that you can use to access information about your company and employees. I've added this resource for more information: Run payroll reports.
I'll appreciate if you can get back to me and share how it works. I want to ensure that this gets resolved. Have a great day!