You don’t need to install any software, you just need a web browser. Click the above link and allow it to use your webcam and microphone when asked. If you have a microphone headset please use it. Wired network is more reliable than wifi.
When you join the conference, please click the chat icon in the bottom left (looks like a squarish speech bubble) and set your name so we know who you are if we don’t recognise you or can’t see you.
Jitsi works best in Chrome or Chromium but if you have any problems try Firefox.