Plug-ins are vetted by a committee before being offered to you for extending Website Builder's capabilities. A new field of ready-to-use functionalities become instantly available on your website, from mobile versions to payment gateways and more.
Start with downloading a plug-in. Then go to your Website Builder install, and click Others - Plug-ins and click "Upload plugin".
When the plug-in is on your web server, click the button "Install". Go to the config menu, retrieve your plug-in code snippet from there or from our plug-in code list, then add it to your page. If the plug-in is free then you're good to go.
In the event the plug-in is fee-based, a link will appear in order to proceed to payment and properly license it. Most plug-ins can be licensed on a monthly basis or for a one-time fee at your discretion.