TT is a DIY program where you are either expected to understand the screens and/or tax forms OR educate yourself by reading all the blue Learn More links. You both probably should sit down with a local tax pro and get these things explained to you so you understand what is happening and why you believe you owe and if that is true how to adjust your withholdings so this doesn't surprise you again in the future.
Going forward ... you may want to wait for the IRS FREE FILE options to come online mid January so you can file the fed & state for free. This year if your AGI was $69K or less then there were 10 free options to choose from...
https://www.irs.gov/filing/free-file-do-your-federal-taxes-for-free
