You can add past club selections just like you would upcoming book club selections--just add the date your club read the book.
1. On your club page, on the "Club Selections/Meetings" tab, click on the "Add Meeting" button
2. Add the book selection and the date you read the book (even the approximate date is fine.)
3. Click "Save"
For example: let's say you know which books your club read in 2014, but not in which order. Just add the books---let's say there are 10--in whatever order you wish, with book #1 having the date of Jan. 1, Book #2 having a date of Feb 1, etc.
To View your past book selections, click on the "View past selections" link: