If you'd like to change your password, you can do so any time. Simply:
Head to your "Account settings". You will find this by clicking on "Menu" on the top right corner of your dashboard.
Select “Change password” next to your Personal details.
Click the “Send me a link” button.
Select the “Reset my password” button in the email sent to you.
Type in a new password in text box and select “Save new password”.
Your password has now been changed, and you will receive an email confirming your change.
You'll need to be logged into your account for this link to work.