Here's a quick run through of how to navigate the category listings via Pinterest.
After you click on any of the category listings from the auction site, it will take you to a page that looks like this:
To view an item more closely, simply click on it and it will bring up a larger image.
If you want to know more information about that item or make a bid, click that larger image and it will bring you to the listing for that item.
If you want to close the larger image so you can move on to see other items, just press the "Esc" button or click to the left or right of the pop-up box (see picture below).