You are already at the auction page?
Very good. Now click on an auction which you want to take part in. To do this just click on a green “bid” in the table:
Now you can see who is bidding currently the most:
To place your own bid just enter the amount of Silver you want to bid in the text field and click on the green “bid” button:
If you were successful and placed the currently highest bid then you are shown as highest bidder. Please note that any successful bid placed in the last 5 minutes of an auction will increase the auction time to 5 minutes again (example: if you bid on an item 5 seconds before the auction would be finished and you would be the highest bidder, then the auction time would go back to 5 minutes and start the counter from there again).
Additionally your biddings are shown in the “Bids” tab now:
Read more about playing bids correctly and how auctions work here.