The Change Password page URL is used for the emails that get sent by the pack and currently nowhere else. It's configurable so that if you create your own Change Password page and add the Change Password web part to it, you can point the email to that
The Change Password drop-down menu option is hard linked to the built in Change Password page. If you'd like to change the location, currently you'd have to change the element.xml file under FBAMenus.
Alternatively, if you want a custom version of the default Change Password page, you could modify the built in page that the menu already points to.