A forgotten password can be reset on the [D4H] sign-in screen. Below the sign-in is a link 'reset your password' Use this to reset your password. A reset link will be sent to you by email. This will also remind you of your username. If the email does not arrive, check your spam folder.
One of the common reasons password resets are required is that your internet browser is automatically entering an old or incorrect password saved in your autofill/saved passwords settings. If you continue to experience difficulty with your password, try clearing any saved passwords or autofill data relating to D4H from your internet browser.