How to modify root files?

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I am a new user of Android. I have a HTC HD2 with OS Android 2.3.2. I need a program to be that the Memory card copied files in the root\system. Tried with some programs, but we failed. What should I do?
Sorry on my English is very bad.

use root explorer

where to find this program? I tried to knock the marketplace root Explorer but under that name, no software, there are some trugi but when I try to copy files I get a message "An error occurred on copy\move". I do not know what the problem is?

+1 for root explorer. It's paid app, but it's really worth the money.

Sent from my X10i using XDA Premium App

root Explorer to my marketplace does not exist.

You could also use DroidExplorer which lets you use your computer to copy/paste/modify the files on your HTC Android phone. Use Google search for DroidExplorer and download the program onto your computer. Then you should be able to change or move any file from your computer, SD card onto the phone. Just make sure to do any changes, save to computer, then copy/paste onto the phone to overwrite the original file.

DroidExplorer not working on my computers. : (
I found the root ekplorer.apk on google and I installed it and now everything works great. Thank you all for your help )