Exactly, once you've registered you'll get a verification email which is also tell you how to get the sign up bonus. But this thread is completely misleading because the actual bonus is not $5 as what OP said but €5 for verifying mobile number.
This is the email I received after registration : http://prntscr.com/7yaamq and this is when I tried to verify my mobile number : http://prntscr.com/7yaayz

sure this one is not legit, i dont see my bonus after verified my phone number by clicking link on the msg they send, luckily im using unused phone number.. not really trusted, or just stay away.. alot trusted site out there, its my advise