Log into the administration area and go to Auctions & Items > View Auctions and select either approved or pending users, which takes you to a full list of those users
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Go to Auctions & Items > View Auctions, click on the auction title and then click on the Registrants button
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Note: It might be necessary to use the Modify Filter button to see Pending, Approved etc bidders.
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To suspend an individual in an auction use the actions on the right hand side. Click on the Suspend button

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An audit box will then appear. Use the check boxes or manually write the reason you are suspending the registrant.