"We've introduced Henri Lansbury tonight, Billy Sharp has come back in and Jermaine Jenas has come off the bench but it's all about formulating a shape and what is best for us," he told Sky Sports News.
"You cannot govern results so it's pointless being disappointed by anything. We just move onto the next game and keep working with the players.
"The performance was a notch above Sunday's against Derby. We manipulated the ball better tonight and now we have to maintain that against Peterborough at the weekend."
The stalemate leaves Forest in 16th place in the Championship table, while Blackburn sit in fifth.