INTERNATIONAL CHARACTERS (F7)
To get a window/dialog where you can correctly insert International Characters in your HTML, press F7. You will then see a dialog box with the international characters, each one on its own button. Just click the one you need and it will be inserted into your open document at the point where you left your cursor.

In the Web Page/Convert menu - you also have the following options:
If you have an International keyboard, when the page is finished, you can choose to highlight a section, or if no section is highlighted, selecting Shift-F11 (Web Page/Convert/International Characters to HTML Tags), you can convert all your international characters to the correct HTML syntax automatically.
With Shift-F12, you can reverse this procedure.