Modifying source code.

A long time ago I was trying to complete a challenge on hts,where I had to modify and post the new source on the site,but I never figured out how to post it,in the url it would say C:\modifiedsource; So I kindof forgot about that and started to use javascript injections instead,but now I'm curious how I would go about posting the modified source to the site.Do I have to modify the action form in the source,im out of ideas.

2 options…if i understand your question:

1. Opera….view source and edit right there…and reload from cache or 2)download the source…then you've got to point the forms all at the site…

i.e. you have the following

index.php :

<form method=POST>

This posts to itself, the modified source would need to be

<form method=POST action=www.siteurl.com/index.php>

There's a mozilla plugin for editing source ;)

https://addons.mozilla.org/firefox/1760/

Thanks for the replies everyone.

Also …. google 'Https'