You can watch "How I Met Your Mother" with Turkish subtitles and dubbing in high definition on several online platforms such as Diziyou and yabancidizi.tv, which offer full HD episodes of the series

. Additionally, the series is available on Netflix, where you can stream it with various language options including Turkish subtitles and dubbing

. Prime Video also offers the series for purchase or streaming, starting from season 1

. These platforms provide access to all seasons and episodes, allowing you to enjoy the show conveniently.