Login then...

1. Select "My Details" under the "Member Menu" on the LHS of the front page.
2. On the next page shown, you'll see an 'EDIT' button above your name. Hover your mouse over it and you'll see a list of actions.
3. Click "Update my profile" and
4. On the "Edit Details" page click on the "Contact Info" tab.
5. Just enter your new password in the "Password" and "Verify Password" fields and
6. Press Update.

All should be good.
Graham