Adapt these three columns to fit you design need. To duplicate, delete or move columns, select the column and use the top icons to perform your action.
To add a fourth column, reduce the size of these three columns using the right icon of each block. Then, duplicate one of the column to create a new one as a copy.
Delete the above image or replace it with a picture that illustrates your message. Click on the picture to change it's rounded corner style.