Cover art for Nook books?

[tealtiger2000]

I've written a story that I've currently finished creating into an .epub file using Sigil, and I'm trying to figure out how to create cover art for it. I don't like seeing the default no cover book on my shelf...I'd like to see the actual cover for the book.

I've looked everywhere online to find out how to create cover art and haven't had any luck. I know Calibre can do it, but I don't like the fact that the program adds its own coding to the html file that I've already completed the way I wanted it in the first place.

So...is there any way to create cover art in Sigil? If so, can someone tell me step by step how to accomplish this? I'm not that familiar with html coding so I need some "expert" advice.

Thanks!

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Nevermind, I've figured it out! I would've deleted this post, but I don't know how...I'm new here. If an admin wants to delete it, feel free. Thank you!