How do I alter the register to read more... redirect?

[equiweb]

I am using the User Extended Component to get more information from users when the register, this works fine when new users click register.
But some of the articles on my site are only readable by registered users and display the message - Register to read more... and when they click this they are redirected to the normal registration page. without the extra bits in the user extended component. How do I alter this to redirect new users to - option=com_user_extended&task=register
Pete.

[dhuelsmann]

You can add your specific code in place of the code described here http://forum.joomla.org/index.php/topic ... #msg553252

[equiweb]

Thanks for that - I found four instances of that piece of code, so changed all of them. I have a new problem, similar to this one. I am using the AdsManager component and in it I can set that registration is needed before an ad can be submitted. AdsManager sends users to the normal registration page and not the extended version. This is on the same site, so the script must be in one of the AdsManager files, but which one?
Thanks again,
Pete.