Can I enter state taxes to look at but not get charged

We have used turbo tax for 5 years.  We file 3 federal and one state.  I usually post my son and daughter's state taxes just to see if I am doing them right. This year it has a pop up box asking if I want my one free state now.  If I say no it won't let me use it.  if I say yes WILL it let me look at the taxes but not file so that I can use the one  state for my husband and I? or once I hit yes that is it?