Recording videocall on Mac

Dear Sir,
i didn’t understand well how i can record my videocall if i use the videocall on the website (if i click on “Start a call” on Jitsi homepage.
Can you describe me step by step. I have a Mac.

Thank you very much

You click record, login with dropbox and at the end, click stop recording and after few minutes your recording will be in your dropbox account.