Click Login link on the right top of the page.
'Login' page will load.
Log in using your credentials.
Click Change Password link displayed on the top of the current page next to user.
'Change Password' page will load.
Provide Old Password, New Password and Confirm New Password.
Click button.
Password will be changed, you will be logged out and 'Home' page will load, if details provided are correct. Login again using new password.