FireFly, sorry, I thought you were using SCMToolkit and were having problems with it. Let me help you out...
Download these two files:
http://www.staredit.net/files/dl/se/gueditrf.exeand
http://www.staredit.net/files/dl/se/guedit.zipInstall the first one, it's the java files required to run the program. Then you will unzip the zip file ANYWHERE you want. It doesn't matter because it will work anywhere.
After you have both the .exe installed, and the .zip unziped and placed where you want it, run the .JAR file in the zip. (GUEdit.jar)
*If it opens up in WinZip or something you will have to go under the properties of the file, and it will have a spot where it says "Opens with:". Change the program to the javaw.exe program found in program files\javasoft\jre\bin\javaw.exe (it may be different for you, just go look for it if it's not where I said, if you installed the .exe then it must be somewhere).*
*If it doesn't open up at all, restart your computer and try again. If that doesnt help then reinstall the .exe and repeat the steps above*
Now, it should bring up a box on the upper left hand side of your screen. It will give you 2 initial options: Load... or Quit.
*Stop right here!* It is important that you make a copy of your map so you don't save your only copy. This sounds obvious to me, but I know people who have locked the only copies of their map. There are two ways to unlock them once you have them locked but one requires a lot of editing and the other requires a very hard to find program. So either way, it's very hard to unlock maps.
Now click on Load, then find the map that you want to lock and load it in. The rest of the buttons should be available once the map is loaded. You can take a look at all the nice features in the program like changing player colors, terrain type, editing terrain, etc.
To lock the map all you need to do is click Protect and enter your name and email if you want, then click Full Protect. After that a popup should appear saying that protect was successful. You then want to save the map, since the program can't save over files, you'll have to create a new mapname including adding .scm or .scx at the end. Save and quit and open your map in staredit to test that it was locked and then in starcraft to make sure it works.
And that's just one way to lock maps. I could give 2 or 3 more tutorials on how to do it with other programs or manually but I'm not. GUEdit is all you need.