。
Please ask at the newsstand.
Literal
News-stand [at-で] ask [please-下さい].
聞く is both 'to ask' and 'to listen' — context (at a newsstand) disambiguates to 'ask.' The locative で marks the place of action. 下さい with kanji is a slightly more formal written variant of the standard kana ください. This is a stock service-interaction redirection ('that's handled at the newsstand, ask there').