Debugging / editing a dll

I have a dll that goes to a specific site for updates. I would like it not to go out to the site and more and check for updates. To do this I want to change one letter in the URL it is looking for. I have found the area in the Code by using PE Explorer from Heaventools, but cannot seem to change just the one letter.

Can the DLL be edited, or do I have to recomplie it ??

If it can what tool can I use ?? and how to change
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RanjeetRainConnect With a Mentor Commented:
If you have the source code, you can simply change the necessary constant/variable and recompile. If you don't, you may have to decompile and then recompile with the changed constant/variable value.

Many decompilers are available. But most of them produce assembly code. But there are some decompilers that can produce equivalent C code too. YOu may want to look at them.

For changing just one character, using a good hex editor can be a quick hack. But this requires a very good understanding of binary data representation methods.
 If the driver/ dll file is make in "Checked" mode, you can et the debugging messag using Kernal debugging tools like WinDbg etc. It is available along with DDK tool kit.
My favorite Windows hex editor:
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