15-20 is the total amount of all alerts set up on all the charts of your
broker 
together. The alerts monitor all the charts for you (if you want them too). You can limit the alerts to the timeframe on which you want alerts, from 1min to 1 month.
In advance you are supposed to make a shortlist of the
currency pairs that you are interested in, and only take the signals relevant to that pairs. Normally one can handle only 4 or 5 pairs at a time. But this is all explained in the video's.
Hm, too bad that the site is closed. It puzzles me. The woman who was supposed to be so successful in with ScientificForex (Cristina Ciurea) -she was able to accumulate 200k usd in her video's - has vanished without a trace too. She used to be active on Facebook, but since Feb she has been silent. This smells like a scam.
They had a pretty good technique for detecting set-ups. It works very well for me. For me that is the only thing that matters right now. I could explain how it works, but that belongs in another thread.
Hans
Be smart! Read the 
Linear Mode
