In the koma script book documentation I (a pure newby) find these instructions:
With the standard classes book and report a chapter title consists of a line with the word “Chapter”1 followed by the chapter number. The title itself s set left-justified on the following lines. The same effect is obtained in KOMA-Script with the class option chapterprefix. The default however is chapterprefix=false. These options also affect the automatic running titles in the headers But I don't understand where to put this chapterprefix=true command, which is what I assume I need to get "Chapter 1" etc. I tried putting it in the preamble via document < settings, but that didn't work. Grateful for help Richard