The FTP features are optional and the website is saved automatically in the BlueVoda Website Builder directory from your computer. The default location is in (C:) > Program Files (x86) > BlueVoda Website Builder. You can save the webpage anywhere you want using the Ctrl + Shift + S key combination. Also, you can preview the page on your PC using the Preview option from the File menu:
If you have issues, I suggest you contact the developers. You can get in touch with them using the contact information from the official web page.