This is the 17302nd most frequent Polish word.
zamieszczonym
"Zamieszczonym" means "posted" or "included."
Here, 'zamieszczonym' is the past participle of 'zamieszczać', used to describe the state of the article being posted on the website, functioning as an adjective modifying the noun 'artykuł'.
Artykuł zamieszczonym na stronie internetowej jest bardzo pomocny.
The article posted on the website is very helpful.
Here, 'zamieszczonymi' is the instrumental plural form of the participle, agreeing with 'informacjami'.
Zapoznałem się z zamieszczonymi informacjami.
I reviewed the posted information.
Here, 'zamieszczonym' refers to the included instructions within the message; it's used as an attributive participle modifying 'instrukcjom' in the dative singular form.