Online preparation and e-filing for 2018 is permanently closed.
To file a return for a prior tax year
If you need to prepare a return for 2016, 2017, or 2018 you can purchase and download desktop software to do it, then print, sign, and mail the return(s)
https://turbotax.intuit.com/personal-taxes/past-years-products/
Remember to prepare your state return as well—if you live in a state that has a state income tax.
When you mail a tax return, you need to attach any documents showing tax withheld, such as your W-2’s or any 1099’s. Use a mailing service that will track it, such as UPS or certified mail so you will know the IRS/state received the return.
Note: The desktop software you need to prepare the prior year return must be installed/downloaded to a full PC or Mac. It cannot be used on a mobile device.
What if you never got W2 form from your employer. My friend was doing a job in a restaurant and they don't give w2 to anyone
What anyone should do if they have not got any w2 for 2 years
If your friend was an Employee and NOT a contractor, their employer is required to provide their employees with a W2.
Here is a great link that provides the next steps to obtain the missing W2 and additional suggestions if you are unable to obtain the missing W2(s):
What to do if I have not received by W2?
(If your friend was actually a contractor and no taxes were withheld from the amount they were paid, a W2 would likely not be required, but the employer may have other filing requirements.)