When a user is locked out, a manager-level user can initiate a password reset.
Resetting a user's password
Hover over Settings & Tools (gear icon) in the left menu, and select User Management.
Select a user from the list.
Click the Password Actions dropdown toward the bottom left of the "Edit User" screen, and click Initiate Password Reset.
Click Yes, I'm Sure.
A confirmation message—"Password Reset Email Sent"—will appear at the bottom of the screen. Note: The account reset is valid for four hours. Ensure the user's availability for logging in during that time.
Note: This is restricted to users with Manager access.