To get this bonus you have to move from another broker to FXOpen. After opening an account with them, contact the support and tell them that you are moving from some other broker and you'll get 5% bonus on your deposit.
You've traded with another broker and didn't like its execution. You have $9,347.91 left in the trading account. You open a real account with FXOpen and inform their support service that you are moving from another broker. When you deposit $9,347.91, you get 5% bonus and your account with FXOpen will be $9,815.30 — that's almost $500 free bonus.
You should be really transferring from another broker.