(e.g., is it a fantasy novel, a travel guide, or a historical text about Speyer, Germany?)
If you have a link to the page where the text is hosted, I can certainly help you figure out how to convert it to an epub format.
(e.g., a specific fan-fiction site like Royal Road, Wattpad, or a local library archive?)
(e.g., is it a specific novelist or a historian?)