If you invited your team to start using Pointman, as soon as you create the employee, they should get an email inviting them to join the team. Once they have accepted the invitation you will no longer see a "Resend Invitation" link on their Employee card. If they did not receive the invitation yet or has not accepted it, you will still see a "Resend Invitation" link.
In the screenshot below, you will notice my test employee has a 'resend invite' button. If they have accepted, the employee will have to try to log in using https://app.pointman.com and click on Forgot Password to reset on their own.
If you do need to resend, Click on Configuration, General, Employees. Select the employee you need to re-send to and click "Resend Invite" as seen above.