No, not really. It'll ask you when you install what eReader you're using, so you can fill in Jetbook there (this is about sizing and formatting so converted books look nice on the screen, and since Jetbook and Libre have identical screens, and Libre isn't a listed option, just pick Jetbook). After that it will automatically default to ePub as the output format for conversions. You'll also be asked where to have Calibre store eBooks -- remember where you put it.
1) Launch program
2) Click "Add books" and add the PDB you want to convert
3) Select the book you just added and click "Convert E-Books"
4) All the options should already be set, so just OK it.
5) The book will now be located under [path to calibre library]\[author]\[bookname]\[filename].epub
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