Big Blue Button - video-conferencing tool with whiteboard functionality

• (Teachers) How do I get access to Big Blue Button?
• Can the default presentation be changed or uploaded previously?
• Is there a possibility to schedule a recurring meeting (e.g.: every week?)
• Do you recommend a particular browser for using BBB?
• If I want to set up a conference that lasts 1 hour and then distribute four groups into breakout rooms for another 2 hours, do I specify the conference duration as 3 hours?
• Can I create breakout rooms in advance?
• If I want to change data on a scheduled conference after the fact, how can I do that?
• Do I need to appoint moderators for the breakout rooms?
• When and why is a lower number of participants sometimes displayed when creating a conference?
• The conference timing is specified as "at least": does this mean that the conference is open backwards. i.e. can run for any length of time?
• Can "shared notes" be saved as a doc file?
• Can the recordings be exported and in which formats?
• Whiteboard: can the drawings be exported?
• Is a conference with 80 participants possible?
• What do I have to consider if I am in a different time zone?
• Error 1020: media could not reach the server
• Screen transmission is poor, menus not readable