Article : Installing and Configuring Ruby Support

Downloading Ruby Support
If you do not have the NetBeans 6.5 IDE installed, go to the NetBeans IDE Download Page and download either the Ruby bundle or the All bundle. If you already have a NetBeans IDE 6.5 installation, but it does not include Ruby support, complete the following steps to add Ruby support to the IDE.

If you are not sure whether the IDE has Ruby support, select File > New Project from the main menu. If you see Ruby in the Categories list, then you have Ruby support.

1. If your network uses a proxy, choose Tools > Options from the main menu, select Manual Proxy Settings, type the HTTP Proxy and Port for your proxy, and click OK.
2. Choose Tools > Plugins from the main menu.
3.In the Plugins dialog box, click the Available Plugins tab, and scroll to the Ruby category...

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Courtesy:- Netbeans.org