User Activity

I want to relist an item that didn't sell. I used Buy it now but want to change it to Auction.After going in to revise my item, I canb't see how to change to Auction format. Help appreciated. Kedoblue
Hi, I want to contact a customer who bought a computer from me 20 months ago. Apple is doing a free replacement of the hard drive due to a fault. How do I locate that customer so far back? any ideas? kedoblue