If you're using TurboTax Online, you don't pay until you Efile. If you have done that successfully, and want to print a copy of your return, go to the 'Print Center' under 'Tax Tools' in the left-side menu while in your return.
If you have already filed, when you Sign In, scroll down to the bottom and click on 'Add a State' to get you back into your return. Then, in the Print Center, choose 'Print, Save or Preview this year's return'. You can choose to print just the return, or with worksheets. Then click on 'View or Print Forms'.
A separate window opens, displaying your return as a PDF file. It's often easier to click on the 'Save' (disk icon) at the upper right if your return is lengthy. Save the file to your computer, then you can open it and print your return from there. You can also choose 'Print' from this window.
If you're using TurboTax Desktop, in the FILE section, click on 'Print/Save for your Records' at the top.
If you can give more details about your printing issue, we'll try to help.