Can I do my own taxes without paying?

It sounds like you are using the online version instead of using the disc that you bought. 

You do not need to pay for your federal return or for Live Assistance when using the desktop version.

Did you install the disc?

If you did, then go into your apps ON your computer and look for the TurboTax emblem.  You should not need to log in, you will just open the program and go through the steps to file your return.  

If you did not install the program yet, you will need to install it to use it. 

The only thing you would pay for when using the desktop version is if you needed to upgrade for some reason (ex. you bought basic and need to upgrade because you have a business and want the guided interview) and to file your state or if you  needed to file more than one state.

We see people get confused and they keep logging in to online software which will require them to pay at the end.   You need to use the desktop software.   One way to tell if you are using the right software---your tool bar.   Online software has the toolbar in a black vertical column on the left side of the screen.   Desktop software has the tools up on the top of your TT screen.

You appear to be posting from online software instead of the desktop CD/download software that the license code is for.  If you are using online, you are using the wrong program.  You need to switch to the desktop software to get what you paid for.  You have to download it, update it and open it up from your own hard drive to use it.  

https://ttlc.intuit.com/community/choosing-a-product/help/how-do-i-switch-from-turbotax-online-to-the-turbotax-software/00/26129