At the moment, I have to

• add the book by searching for book name
• clicking 'Want to Read'
• search again, and click on the book, because I always forget that it won't then take me to the book page!
• on the book page, click See reading journal
• click New Entry
• click Note
• write note and save

be great if there was a way to do this more easily; if it was more obvious I'd add more notes as to who recommended books to me (etc) which would be helpful later when choosing/reading books