The "Icon, Text and Button" element is an info box, that is often used on the start page or as a promo box in a right hand column on subpages. You can find the element below the tab Content elements when creating a new element. (img. 22.214.171.124)
In the 'General' tab you can see the content element type 'Icon, Text and Button' selected (1).
The element uses the regular header field (2) and a text field (3), which is a plain text field, and it is not possible to format this text with row breaks, linked text or any type of text transformation. (img 126.96.36.199)
Moving on, you can set a link text (4), link address (5), set if only the button should be linked or the whole info box (6), if the button should be a text link instead of button (7) and finally select an icon by clicking on it (8). (img 188.8.131.52)