Personal pronouns are used to refer to people or things. They include:
* I, me, my, mine (first person singular)
* You, your, yours (second person singular/plural)
* He, him, his, she, her, hers, it, its (third person singular)
* We, us, our, ours (first person plural)
* They, them, their, theirs (third person plural)
Since posters are not people or things that can act independently, they don't have a personal pronoun. You would use a different type of pronoun or phrase to refer to them, such as:
* It: "The poster is colorful."
* That: "That poster is about environmental issues."
* The poster: "The poster was torn."