Hi CeeCee, that is a very good question! If you start with a single column and image you can hover over that column within your section to bring up the blue “Column” icons. Click the “3 bar” icon to bring up your column option and click clone. Each time you clone a column it should create a duplicate equal sized column within the section. At that point you should be able to go in and swap out your images and content.

I hope this helps!