How to insert a widget to product's detail page?

Hello,

I just want to insert widget (custom mvc) to one of my product's detail page which I've created in Modules.

I have book + detail page auto generated) where I want to put a button 'Take a book' and when a person click on this button to make some changes for this book.

How to insert this button in detail page (I can't drag and drop the widget) and how to get the information about current book page (id, name - these data i will use in my Action)?

Thank you in advance!