You can still e-file unless you have some glitch preventing it. (That might or might not be fixable, depending on what the problem is.)
If not, print, sign and mail your return. Include any required documents per the instruction page (like W-2s and 1099s that have taxes withheld). Also, make sure Turbotax recognizes and includes the payment you made. Don't forget to sign. And don't forget you probably also need to print, sign and mail your state tax return. They go to different addresses in different envelopes. Be sure to include all required documents. Some states require that you include a printed copy of your entire federal return, some states do not require this.
