Hi cinnamonyyc,
It's vital you're able to log in and enjoy the time-saving features which QuickBooks Online offers. Rest assured, I'll be happy to help you log into your account.
First, I'd like to start off by doing some troubleshooting to determine if this isn't a browser related issue. To check this, I suggest clearing cache and cookies on your browser. Doing this will help fix most issues the site may be having. Here's an article which shows you how to do that: How to clear cache and cookies. If this doesn't work, I suggest having them use a private/incognito window. I also recommend double-checking to make sure your internet connection is working since QuickBooks Online relies on internet to work.
If you're still having issues, I recommend contacting our support team using this link. Otherwise, enjoy the rest of your week and feel free to reach out if you need anything.