Hello,
Adding items to auction house
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/auc start [amount of items in auction] [starting price] [bid $$ increments] [time for auction in seconds (s)].
Note when you start an auction, the auction you want to put into auction must be the item you have in your hand while performing this command.
Removing items from the auction house
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Go to /auc
Then go to your head, it is the closest to the right side. Click that.
Find the item you want to remove from the auction.
Then left click on that item, you will go to a red glass, nether star, and green glass. Click the green glass to cancel auction, click red glass to keep the auction and click the nether star to refresh.
How to bid on auctions
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To bid on auctions you have several ways.
#1 Way
Go to /auc
click on the book, closest to the left side. Find an item you want to buy in the auction. Click the item, and click the green glass to get into the bid (note you will lose the money when you bid) (However if someone overrides your bid your money comes back)
#2 Way
/auc bid [Number of the auction (#)] [quantity]
I hope this helped, contact me if it doesn't! :D
Thanks!