The whole idea behind the biweekly payments is to get the equivalent of 1 more monthly payment.
12 months = 12 monthly payments
52 weeks / 2 weeks = 26 payments = 13 monthly payments
You do not have to get into any special kind of program to get the benefit, just give extra principal per month to get the faster amortization.
Most important is whether or not your loan has some kind of prepayment penalty.
I guess by now you already signed
Sorry did not check the site until now