hi @Norman-Mitchell, welcome! you can drag the cursor around that section to highlight it, then either right click and choose Cut, or click CNTRL + X. hope that helps!
If you do not need to paste the selected data somewhere else (cut), the 'Delete' (clear) command will also remove it. The same as your keyboard's 'Delete' key .
btw, seasons greetings and welcome to the Magix Sound Forge users community @Norman-Mitchell.