Just pushed out a long overdue update. You can now edit the details of an item in your collection straight from the item page. You no longer need to go back out into your main collection and find your game to edit the details. There is now an Edit link down in the My Collection portion on the item pages. This should really help during edits.
As always, let me know if you have any issues.
Note - if you don't see the Edit button, clear your cache and try again.