Sorry if wrong section.

Hi, New to betting, when I signed up to bet365.com I deposited £5, and then £10, then I received a £10 bonus so my balance was £25 to bet with. After numerous small bets winning and losing, and then a larger £72 bet I won today, my balance is at £102. The £72 that I just won is withdrawable, and my bonus is now at £30(I dont know how this is). If I withdraw the 72, I lose the 30, what's up with that?

I also don't understand what this means

Just to make you aware you will need to rollover your deposit and bonus three times prior to making a withdrawal. We will contact you again when you have met the rollover requirement.

Thanks