What is a wish list?
Wish list is like book marks, Wish list is like favorites. While browsing Kinige, you found that one of the books is interesting to you, but you don't want to rent/license the book right away. In that case the book can be added to wish list to easily remember.
How to add a book to wish list?
Visit the book page you are interested in. Then simply click on Add to wish list button on right side.
How to remove from wish list?
Visit the book page and then click on Remove from wish list button on right side.
Not right now. A feature which might come in future releases. Keep watching.