On the top bar of Desktop:

Go to EMPLOYEES

Select MANAGE PAYROLL CLOUD SERVICES

Click on INVITE EMPLOYEES for your Quickbooks Workforce

Login with your username and password

Locate the Employee you want to invite.

-On the "left" side of employee's name is a square box.  Go ahead and click inside that box to highlight the employee's name. 

Once you've selected your employee(s), click SEND INVITE.

This only works if status shows "Invited" or "Not Invited"

If status shows "Signed Up", unfortunately the employee has to call the 1-800 number themselves.