When you have exported a web page or an interactive applet puzzle you will need to upload the files to your website.
After exporting a file you will be shown a list of the files that need to be uploaded. You can if you like drag and drop these files to your web folder or FTP (uploading) software. Otherwise, use your uploading software to upload the files from the export folder.
If you export an interactive puzzle you also need to upload the applet files. You only need to do this once since all your puzzles can use the same applet files on your website. These are automatically copied to the folder where you export the web page.
WordPress sites can use the WordPress Plugin to easily upload the puzzles.