Instead of placing my entire shelf on "vacation" hold, I placed several individual books on hold. Now I can't figure out how to "unhold" them. Do I need to post them into the system using the ISBNs again?

Go to your bookshelf. Directly under the tabs (it's right under the "Buddy List" tab on mine), there's a View drop down box that has 3 options: All Books, Posted Books and Books on Hold. Change that to Books on Hold and it will show the ones that you have on your shelf that are on hold.

Each book will have a checkbox on the far right. Click anyone that you want to post and press the post button. The post button is on the line below the View drop down. That should get them posted again.

However, if you put the books on hold (not vacation hold), and later put them back in the system, they go to the bottom of the list, so if you put 'XYZ" book on hold, and it's in the #3 slot when you do that, it will go back down to the bottom and not back to the #3 slot where it was when you put it on hold.  Pat

Thanks to Tim and Pat for the instructions and info. I had a suspicion my books would go back to the end of the FIFO line. I guess next time I'll have to put my entire shelf on vacation hold.