Part 2 of the tutorial walks you through exporting an unsigned apk file and then signing it manually using batch files. It is much easier to export a signed apk file. Once you have your digital signature file created you can just right click on your project in eclipse and click Android Tools->Export signed application package. This will popup a signing dialog. Follow it through. When you get to Keystore Selection, browse to the location of the digital signature file that you created earlier and pick your signature file. Enter your digital signature password (twice) and your app is exported and signed. Much easier than using the signing batch files.