To place a bid, make sure you're logged into your Garage account. If you don't have one yet, you'll need to create an account first.
Click the Place a bid button on bottom right of the listing images.
You'll see the "Place bid" pop-up. By default, it is set to max bid. If you're unclear what a max bid is, you can click the "how max bidding works" link to learn about max bids.
To place a manual bid instead, click on the V dropdown above the text field. Once you see "Manual bid" above the input field, specify the bid amount and click the Place bid button.
Next, verify your card.
Lastly, click the Confirm button to complete your bis submission.
All set! You've submitted a bid.