I am confused about when I can use the possessive nouns.

我对什么时候可以使用名词所有格感到困惑。

Now these words are possessive nouns, but what if we make them possessive pronouns?

现在这些词是名词所有格，但如果我们把它们变成物主代词呢？

I think people get them muddled up because they confuse possessive nouns and possessive pronouns, and they're different.

我大家把它们搞混是因为他们混淆了名词所有格和物主代词，二者是不同的。

Remember that possessive pronouns NEVER have an 's' added to them, but possessive nouns do.

请记住，所有格代词永远不会添加“s”，但所有格名词会。