Checkout page URLs updating

Hi,

In the eCart wizard, the last page specifies the checkout pages' addresses.

For remote checkout it's stated that a full http path may be required. In the wizard these URL fields are prepopulated with the site address, as is the site address.

My site is currently in development on a local webserver - not yet uploaded to a live server. The site address, success and failure URLs therefore read:
1) site address: mysite/
2) success redirect URL: checkout_success.php
3) failure redirect URL: checkout_failure.php

QUESTION: When uploaded to the live server, do these URLS update themselves automatically? If not, how can I update them - I can see no way to modify the settings through reentering a wizard. Nor are these URLs visible in my source code pages.

Please advise. Thank you.

Ann