You may bid on only one clan hall at a time. Once a bid is submitted, that amount is deposited into escrow with the auction house. A 10% transaction tax is also deducted from the bid. The transaction tax is non-refundable, even if the bid is canceled.
Your bid must be higher than the minimum bid (or, when re-bidding, the previous bid). The clan that has submitted the highest bid at the end of the auction wins.
You currently have Adena in the clan warehouse. The minimum bid is Adena.
How much do you wish to bid?