To add the auction time and date on the listing:
Make sure the listing's authority is Auction, this can be checked by going in to the Listing Details section of the Listing.
Once the Authority is selected as Auction, a couple of fields further down, you can put the Auction Time and Location under the Auction Time and Auction Location field.
To Remove the Auction Time and Location:
Make sure the authority of the listing is Auction.
Click on the 'x' button under Auction time to remove the Time.
Remove all the text from the Auction Location.
Change the authority of the listing to be something else other than an auction.
Hit Save at the bottom.
Note: Changing the authority from Auction to anything else without removing the Auction Time and Auction Location could still display the Auction details on the listing and use the above steps to Remove the Auction Time and Location.