Hello World Plugin To install the plugin, modify config file (contentbuilder\config.js) as follow: _cb.settings.plugins = ['helloworld']; This plugin will add a 'Hello World' button on the 'More' popup on toolbar (click the 'More' button). You can also add the "helloworld" button on the buttons or buttonsMore parameters: var obj = $.contentbuilder({ ... buttons: [..., "helloworld", ...] }); or var obj = $.contentbuilder({ ... buttonsMore: [..., "helloworld", ...] }); For more info about buttons or buttonsMore parameters, please check the ContentBuilder.js readme.txt.