Since it's said from the OP you can get 100% bonus up to $25 meaning if you deposit $20 you can get 100% bonus of $20 but if you deposit more than $25 sample like $50 or $100 you can only get $25 because it is the maximum bonus you can get.
This is correct
so after i register and deposit, i just contact support and the bonus will land on my account?
Yes, we may say it will be added within 24 hours, but most are being done within 15 minutes
let me clear this alright since i'm lil bit confuse, i deposit 20$ and then i contact the support after that the bonus come to my account? Meanwhile my balance will 40$ right? after that i play in slot or something and maybe i win around 10$ lets say, and my final balances is 45$ for example, so i can withdraw it?
The $20 bonus will be added as casino credits, specifically for the game Pizza! Pizza? Pizza! Whatever you win from that is withdrawable, as long as you have also played through the original $20 deposit (so people don't just deposit, collect the bonus, then leave)