1) Make sure you're on the ELEMENTS tab, select the MULTIPLE COLUMNS layout icon, and drag it to the content area of your page. You can adjust the width of the columns by touching the vertical bar(s) and once you get the <> arrow, sliding them/it to the right or left.
2) If you want more columns, hover over the blue bar at the top of the section and select the number you wish. Slide the vertical bars to adjust your column widths. Want more than five columns? Select four columns in your first section and pull down another MULTIPLE COLUMN section, then choose what works for you.