How do i unblock google crome?

okay so i use to use Mcafee but now i don't and at the bottom this thing came up saying Block Google Crome or Unblock then by accident i pressed Block and i read some info it said go to the firewall so i clicked Navigation and then i cant click it because i have to buy it!! so im really pissed of so can anyone help me???????????????????????????????|||donot worry just click setting check it in allowed programs list find it and move it to the allowed list best wishes