Open the required Client Record page and in the top navigation click on [Sign in as]. You will be securely signed in to mirror the client account and will be able to place any bids on their behalf in the usual way. The system has been designed so that the client is in no danger of bidding against themselves if they subsequently sign in to bid themselves.

Note: Be sure to sign back out of the account as soon as you have finished placing the bids. You will need to sign back in to your admin account.