You should be able to just mouse over the Audio and Captioning icon in lower right of your screen to change the language for both the audio track and the subtitles. Alternatively, you can also pause the video which should bring this same menu overlay if you are watching in fullscreen. (see image below)
The Settings mentioned by @RokuKarla are for Roku devices and only applicable to them.
I don't have Topic, so below image is just general content playing in the online Roku Channel (laptop/PC). If after changing the Audio track to English and still hearing a foreign language, then likely something wrong with the movie. Same goes if subtitles refuse to turn off. (I did check for the Girl with Dragon Tatoo on Topic and is showing English for Audio and Subtitles. - occassionally there are errors and the wrong audio will play or be unavailable).
click on image to enlarge.
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