A search of this phrase yields results which are generally Polish. Fortunately, certain Web Browsers offer its users the chance to translate the results of their web searches.
Most search results for "Poctza FM" are likely written in English, as "Poctza FM" looks like a misspelling of "Polka FM," which is a genre of music typically associated with English-speaking audiences.
Poctza is Polish. It translates loosely to "post" in English. It most generally is used in the statement 'poctza polska', which means post office in English.
The phrase poctza tlen in Polish means mail oxygen in the English language. Mail oxygen is used for people at home who need home oxygen and it gets sent through the mail.