Have you tried long-pressing its icons to see what items come up?
Also, go to Settings->Apps-All->Kobo and see if it's set to Launch By Default (if you're able to launch it from a book's icons and you have multiple epub-handling apps, then it should be - IF it's not something hard-coded into Tapestries' pinning code). Hit the "Clear defaults" button. That should then make the system ask you which app to use the next time you tap an epub's icon.
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