If you mean just how to create a webpage, simply open a program like Notepad and start coding. However, although that's what the professionals use (for the most part), you may want to use a WYSIWYG (what-you-see-is-what-you-get) editor like Dreamweaver or FrontPage.
If you are talking about inserting another HTML page inside an existing one, use the iframe attribute, <iframe src='http://google.com' width='AApx' height='BBpx' />
If you are talking about creating a whole new separate page in your server/directory (like something.com/newPage.html), Every FTP server usually has an option to create a new page and/or edit an existing one.
If you are talking about using HTML to create the page dynamically, you cannot. Only server-side languages like PHP, ASP, or JSP can do this.
If I did not answer you question fully, feel free to email me and I will answer you shortly.
Good Luck!
