To zoom in, click and drag with the mouse to select an area (on mobile, drag with one finger).
To go back or zoom out, use your browser's back button or the Navigation pane.
To see more detail as you zoom in, increase the Iteration Threshold in the Settings pane.
Try increasing it a few hundred at a time.
Try different colors and color modes. One may look better than another in different situations.
To save the image to your computer, simply right-click and choose "Save Image as..."
Your position in the set is stored in the URL in your browser's address bar.
If you want to save your current location for later, simply create a bookmark.
To share it with someone, send them the full URL as a link.