Oh my venus

is it my computer …? then used phone to watch episode 15 of oh my venus. and the pop up to log in keeps making the episode go back to the beginning. Then I thought it was internet explorer so downloaded firefox and the subtitles don’t come on for firefox.
Hence I cant watch the episode 15. is there a bug or is the settings totally wrong. Please help… as this is such a good drama and despite me watching lots of them I still cant speak Korean hahahaha. HELP PLEASE… thanks xx