I think you get the explanation oficial first with support and/or bonus section on bc.game ...
... but in any case, that's why I wrote "joder" because it's something that most people know, on the other hand it's not a big deal as you can read.
To the point of your question: Coco comes out unexpectedly every so often and you just have to click on it.
Exactly.
Furthermore, at random times several times a day you will see an animation popping up ( looks like a crocodile in various costumes ), mostly coming down on a spider web (like spiderman) or out of a green pipe (like super Mario). You have do click on it fast and get some free BCD work like 0.4-0.8$ usually.
If you are not on the page 24/7 it's kind of tricky to catch it since it really is totally random, maybe you will get lucky and see it some day soon.