On a PC or Mac, go to the join.me website and click Share. More precisely, click the big orange button next to the word Share.
The join.me application will download and run, then your screen will be ready to be shared. If the download does not automatically install you will need to locate the download file and install it.
How do I know join.me has started? You’ll see this on your desktop. We call it the join.me toolbar. More specifically, it's the presenter's toolbar. If it's not visible, join.me is not running and your meeting can't start.
join.me on a Mac
Can't find the join.me toolbar? Maybe it's hiding. That is, if you are using more than one monitor, look for join.me on your primary monitor. It will always start on your primary monitor, even when you launch it from a secondary monitor.