To print a return, if you have the Online version of TurboTax, open up your return (go into one of the sections), then look at the left side menu. Select Tax Tools by clicking the down arrow next to it. You should then see two options, Tools and Print Center.
If you have already amended your return and you are having a hard time locating the 1040X, try using the Tools option and select Topic Search. Type in 1040X and you should be able to navigate back to the area where you can print this form.
See this article and this one for more information on filing an amended return with TurboTax.