The block you are using now calculates the profit made out of a group of trades. This is not the actual account profit (Equity minus Balance).
If you want to work with the account Equity, then use the Condition block. Something like this:http://prntscr.com/chp8ps
But if you still want to use the blue block, then in "Profit amount" you can use the native functions AccountEquity() or AccountProfit(). For example, you can try with value such as: AccountBalance() * 0.1. If the balance is 1000, then the result of this calculation will be 100.