To install an extension, go to the extension category on the Palette and press import extension. In the pop-up window , press choose file if you want to upload from your computer or choose URL if you have a url from a website and finally press import. Once imported , drag and drop the extension in the Viewer, to be able to use it. When you go to the block editor you can see that your extension is also there and you can use its blocks like you would do with all other components.
