To trigger and stop a record, you have several options :
• Start on button / Stop on Button.
• Start on level (0db by default - it can be changed) / stop on level (-20db by default - it can be changed).
• Start on time / Stop on duration (3 minutes by default - it can be changed).
NB : if you use the lasts two recording modes (level and time), you must trigger the recording by clicking on the "record" button first. 
It is important to note that once the recording has started, it starts to save itself in the database. This means that once the recording is stopped, it is immediately visible in the Browser. And if the computer is accidentally shut down, the recording is saved until the machine stops.