The NFC North side lost their opening game of the 2013 NFL season to the San Francisco 49ers on Sunday.
The quarterback told the team's website: "We have to be more consistent and help our defense out a little bit. We lost the time of possession battle pretty significantly. That puts a stress on our defense. We also had four scoring drives over 60 yards. It was the good with the bad.
"It's on us. We have to score more points. We feel like we should get into scoring territory every possession, and obviously if we don't do that, we look in the mirror and we say there were things we could have done better.
"Regardless of how many points our defense gives up or doesn't give up, we know we've got to outscore the opponent, and that's about us."
The Packers play the Washington Redskins in their first home game of the season this weekend.