Hallo, ich habe die untere Abdeckung entfernt. Ich bin mir nun nicht sicher, wie ich das Leuchtmittel herausbekomme. Wie und wo kann man das eventuell lösen?

Reposted as no [] in first post. My wife bought this watch for my son. I would have chosen a different brand - but here we are. I am trying to adjust the chrono setting. On the video I am first trying the chrono time keeping in general. Seems to spin the wrong way? Then pulling out crown to setting B to recalibrate. Does not work perfectly. Also cannot activate other sub dials then the bottom one…..Any recommendations?