Instructions
Open your web browser and visit the MCLawl download page to download the .rar file which contains all required files. Right-click on the file when your browser has finished downloading it and select "Extract." Select the following directory in the file browser: "C:\Program Files\Minecraft\config" and click on "Extract" to finish extracting the files to that location.
Launch Minecraft by clicking on the game's shortcut in your Windows Start menu.
Click on the "Tools" tab and select "MCLawl 1.2" in the "config" drop-down menu.
Click on "OK" to go back to the main menu and start a new game by clicking on "Generate." Minecraft will now load the MCLawl server files and connect you to the appropriate map.