Why these is a flay when I add new employee saying 'you need enter some missing information' ?

Hi mhe-alcc-ca,

Thanks for reaching out here.  Welcome!  It's important that your employees are set up accurately in QuickBooks Online Payroll, to ensure a positive outcome on their pay period and yearly forms.  I'd be happy to help!

When you see a notification to enter missing information, follow these steps;

1. Open Payroll from the left menu and then Employees

2. Click on the employee that has an 'alert'

3. Review their Profile information and click the Edit ✎ next to the section with the alert

4. Complete the required fields

5. Hit Save when done

If you require additional assistance, please don't hesitate to contact us.  

Schedule a Callback or start a Chat: click (?) Help in the upper right in QuickBooks Online > enter "Contact support" > hit Contact Us > provide a brief summary of your situation > hit Let's Talk > choose Get a callback or Start a Chat.
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Should other questions or concerns arise, please feel free to reach back out.  We'd be glad to assist!