How do I send an invitation to timesheets to an existing employee?

Welcome to the Community, @kevinmccallum10.

Inviting an existing employee to QuickBooks Time is easy. I'll show you how to do it: 

1. Go to the Payroll tab, then Employees.
2. For an existing employee, select your employee.
3. From Personal Info, select Edit, then add your employee’s email address.
4. Click the Invite this employee to track and record their hours with QuickBooks Time by QuickBooks checkbox.
5. Press Done. 

Your employee will now receive an invitation link via email. Let him know to check and accept the invite, then have him create a user ID and password if they haven't already.

Once done, let him to Download the QuickBooks Time app.

For future reference, check out this article to learn more about managing and tracking time off in payroll. 

I'll be there for you again should you need more help inviting your employees in QuickBooks Time. Take care!