When you have forgotten your password you are given a randomly generated password and it is important to change that password when you log into your account. Or sometimes you would like to change your password every so often as it is good practice.
When you have logged into your account you will see on the top right hand corner in between the your email and the bell icon a person icon. Clicking on this will open a menu for you to make a choice.
From this selection if you click on the 'Change Password' option a new form will pop up, which will allow you to change your password.
From this form start by entering your old password or the randomly generated password, and then enter your new email in the following two text boxes. Clicking on the change password button will automatically change your password and you can use your new password straight away.