When should we use proper name mark and how to type it?
First of all, proper name marks is a part of archaic Chinese. It's no longer used in modern Chinese. In modern Chinese, only book name, music name, movie names, and etc. will be marked with special punctuation, such as 《新约全书》. You can type it by switch to most Chinese input method and use '&lt;' and '>' key on the keyboard.

As for using proper name marks, usually you can just use an underline or a double underline. Doing it in Word is pretty straight forward. In StackExchange could be complicated, you have to use HTML code, such as &lt;u&gt;测试&lt;\u&gt;. For double underline, it's even more complicated, see here .