To get subtitles, you can get it from OpenSubtitles.org.
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Tap the Settings button on the left side of the playback screen.

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Select Add Subtitles in the Subtitle tab.

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Select the subtitle you want to load in the OpenSubtitles.org tab.
* Available only if connected to a network.
* Network tab in the Add Subtitles is available when playing on network.
If you want a subtitle that is in the network server when playing locally, you have to download a subtitle file from network server to local.

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Select the subtitle loaded from OpenSubtitles.org.

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You can enjoy watching videos with new subtitles that is loaded from OpenSubtitles.org.