changing base url - how and where?

Can anyone tell me how to access the site/config.php in the dashboard please so I can change the base url that concrete sets up on registration to my actual web address please?

Think the following is what I am suppose to do but not sure where to find the bit to change.

By default, Concrete5 will forward any requests to your site to the specific
BASE_URL you define when installing.
This is for cookie/session authentication purposes.
If you'd like to disable this to ensure that your site is
served at multiple URLs, add this line to your site/config.php:

<?php define('REDIRECT_TO_BASE_URL', false); ?>

Thanks L

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ScottC replied on at Permalink Reply
it is under siteroot/config/site.php, as in you need ftp details to change it. You can't write that to the dashboard(though that seems like it would be nice to have a page that does that for you).
fergielol replied on at Permalink Reply
thank you for your help. all sorted now. :)
Brainakazariua replied on at Permalink Best Answer Reply
You can install this add-on ( it will also allow you to change your site.php through the dashboard.
Ihateit replied on at Permalink Reply
I've tried this. But when i make changes in the backend, and press "Finish Edit"-button it jumps back to the old URL. Should go to but goes to instead. I've edited the site.php file, but still this error..