Two options that I can think of.
1) Tap and hold on the individual book and select Add to collection. Then select the collection(s) you want the book in.
2) Go to My Collections from the Home screen or Library screen (there is a dropdown where one of the options is My Collections, others are Books, Previews & Articles from Pocket). Tap on the collection. Tap the menu (three lines) option in the bar below the collection name and select Manage collection. Swipe through the library pages putting checkmarks by the books you want to add to the collection.
Hope that makes sense.
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