We use the Spanish simple future to talk about what<em> will </em>or <em>shall</em> happen. It is also used to talk about the possibility of what someone <em>may </em>or<em> might</em> be doing in the present. The verb poner translates into to put in English. The subject pronoun ustedes means you all, so the conjugation of the verb poner that matches ustedes is pondrán.