After listening to that video, hopefully you have Eclipse installed.

Most serious Java developers like NetBeans more, but I'd rather stick to Eclipse, that is simpler. Also, in NetBeans I do now know how to select as source folder any folder so that's something against it...

If you couldn't see the video for some reason, just know that to install Eclipse you have to follow these steps:

1. Open up http://www.eclipse.org.
2. Go to the "Downloads" tab, and download Eclipse IDE for Java Developers (at the moment it is 92MB). Select your OS, and download.
3. Install it wherever you wish.
4. Open it up, and click New --> Java Project.
5. Name it, and in the Source Folder select your RSBot folder, that hopefully you have downloaded.
6. Click in finish (you don't want to change anything more).
7. There you have your project (in the left hand side).
8. Now, when you click in the opening arrow of your project, you will hopefully see the RSBot folder. What you want to open is the "Scripts" folder, and in the default package, click in New --> Class.
9. You've got your Script there, ready to be programmed!

So, this tutorial has just left you with installing the tools. You will need to install the JDK in the process of installing Eclipse. To do so just do go to here (sun's official page) and download JDK 6 Update 15 (at least this is what it is as of today).It may prompt you to download Sun's downloader, you may do so if you wish, but you can also download it normally (by clicking the download link instead of the download button).
Now you should be set up to start programming! My next hub will be about an introduction to data types, so lets get started!