Fractal

hi, Im a new in the design and i was doing the tutorial creating simple fractal , I want to know why when I want to do this part of the tutorial:

" Find the ‘Paths’ window or go to Windows>Paths. You should see your path there. Click the ‘stroke path with brush’ button."

dont let me do it, only let me work whit the next one that is selection…
please I want to find my mistake.

thank you