Use Amazon Prime Video app
Do yourself a favor. Before trying to use this poorly designed and ill-featured app, check to see if the HBO show you want to watch is available on the Amazon Prime Video app.
All the features that this app doesn’t have, the Prime app does. Prime is faster, has up front continue watching, and allows you to add series to a watchlist. Yes, the series, not a useless single episode. Try again HBO.
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HBO GO: Stream with TV Package, v13.0.0