Need help with welome e-Mail of new members

Hi,

I have set up my subscriptions. However, I have created a custom log-in page versus using the default http://www.yourwebsite.com/wp-login.php

When a new user signs up for my subscription it automatically sends them an e-Mail with the username, password, and this link to log in from.

Is there a way I can customize this message to display my other custom log-in URL instead?

Any help would be GREATLY appreciated.