I can’t read kanji, but I spot the letters ‘FTP’ in the second screenshot.
Read up about FTP. It’s the most common way to upload files to web sites.
Find an FTP tool that you like. For Windows I recommend WinSCP (because it’s small and free)
Upload your website to the right folder (usually either the root folder or htdocs).
Make sure your have a file called ‘index.htm’ or ‘index.php’ in there, it’s what gets loaded when someone visits your site without specifying the page.
There’s a lot more stuff to know, but maybe this will help you get started