To change your password log in to your account dashboard, then navigate to the "Account" tab at the bottom left corner of the page and click on the "Account overview" link.
Once the page is loaded you will see a summary of your account. The current available balance on the top-left and the name of your company on the bottom-left. On the bottom-right you will see an overview of all the contactpersons that are currently in your account.
By clicking on the name of a contactperson you will be taken to the details of that contact. If you then click 'Edit' on the top-right you can edit this contact.
Scroll down to the "Login Details" section, and type in the desired password.
Once you filled in your new password click 'Update Contact' on the bottom-right to save the modification.