How do I: Upload 1 Hi-Res image and store it in multiple resolutions

I am looking for this desperately too…

Your solution is here:
https://www.wprecipes.com/how-to-resize-images-on-the-fly ??

Thank you for replying.
I did this:
1. Get the script and save it on your computer (I assume you named it timthumb.php)
2. Use a FTP program to connect to your server and create a new directory called scripts. Upload the timthumb.php file in it.

AND THIS I DON’T UNDERSTAND:
3. Once done, you can display images like this:
<img src=”/scripts/timthumb.php?src=/images/whatever.jpg&h=150&w=150&zc=1″ alt=”” />

where in WP dashboard do I check this?