Click Forgot password on the login screen and enter the email on your account. A reset link arrives within a couple of minutes and stays valid for one hour.
If it doesn't arrive, check spam first — some corporate mail filters delay transactional email. If it still hasn't shown up after ten minutes, contact support with the email address on the account and we'll issue a manual reset.
For security, reset links can only be used once and invalidate any link sent before it.