Move your mouse to highlight an area in the map-editor, then mouse-click to go to an description of that area. (Graphic-example from QuArK v5.7)

Whenever you see the text " Press F1 for help " in the little hintbox under the dataform-display, you can press F1 and get a Hint Pop-up window, which tells you a little more about the item you are pointing at. Some of the Hint Pop-up windows will have an InfoBase button that is linked directly to a page in the InfoBase and will give you further help for the item in question. If you are new to QuArK, these hints and InfoBase links come in handy if you do not know exactly what the item you are pointing at, does. So press F1 to get the hint and information available, before asking about it in the editing-newsgroups. Once you move your mouse outside the larger hintbox, it will automatically disappear.