How you can nudge new users to login for the first time if their invite has expired.
If you've invited new users to join the platform the link to join the LMS and set a password will expire after 72 hours.
If you need to resend the invite to an individual:
Head to the users list
Find the person you'd like to resend the invite to and click the "resend welcome email" button: 
The welcome email will be sent to that user with another 72 hour link.
If you need to resent the invite to a group of users:
Head to the users list
Select all the users you would like to bulk resend, the button will appear at the top of the list: 
Once you've ticked all users you'd like to resend the email to, press the button and the system will resend the invite to all selected with another 72 hour link.