Remember:  A noun does not immediately follow a possessive pronoun while a possessive adjective always comes before a noun.

What does this line mean?????Can you please explain..

Possessive pronouns are the pronouns indicating possession or ownership. For example: my, mine, our, their,yours etc.

Since, an adjective always comes before a noun and possessive pronouns also come after a noun therefore, possessive pronouns are also known as possessive adjectives.

The example given by you is incorrect because it does not have any possessive pronoun.

Some examples for possessive pronouns are:

• The book lying on the table is mine.
• Our teacher has taught me this lesson very nicely.
• My pen is not working. Can I borrow yours?