If no extension already exists for the functionality that you want for your site, you can create your own. These extensions must be programmed in PHP. Besides knowing this language, it also helps if you have SQL experience. The development itself is facilitated by the Kickstarter extension. But be aware that this tool only supports you; it does not do the work for you. It can create simple extensions, but if you have a complex application, you cannot build it without knowing PHP and SQL.
The Kickstarter extension is the best tool for creating extensions. More than likely you will have to first install Kickstarter from the extension manager (extension key: kickstarter). After the installation, you will find the new entry Set up new extension in the Menu dropdown of Extension Manager. Open Kickstarter from this menu item.
You will see dark green fields with plus symbols in the right part of the window. You can use these to call up...