Just install the extension and add a new Content-Element to your page.
You have to select how many columns you want to use and which Elements should be rendered. The content elements will be distributed line by line.
There may be further information which is not included in this document yet at http://www.rs-websystems.de/typo-3/extensions/rscontentcolumn-content-elemente-in-spalten-anordnen.html
Q: Where should the Content-Elements be stored?A: There are to possibilities where to store. First, within the same page in a non-visual page-column, second is in a SysFolder. If you wanna use the Extension on only a single page or display content on several pages, it may be better to use sysfolders. In my opinion it is more practical to store content within the page using a column which is not rendered to page. Even if this Column is not displayed in Web->Page modul, you can Access and edit via Web->List.

