Evo citat iz uputa (stranica 28 - Imaging):
To take a picture or record video
  1. Slide open the lens cover.
  2. Use the navigation key to switch between camera and video recorder.
  3. Camera: Press (-) half way down to use auto focus and then fully down to take a picture.
    Video: Press (-) half way down to use auto focus and then fully down to stat recording. To stop recording, press (-) again.
...
("(-)" je slika tog gumba.)
Nemam upute na HR, ali vjerujem da je isto to samo prevedeno.
Pa ne znam kako si to citao, kad eto ocigledno pise.

Nisam mislio biti nepristojan ni nista, ali ovo je tako banalno pitanje da sam se morao nasmijati. Sorry ako sam te uvrijedio.