You don't. You WAIT for your W-2's, which will be issued by employers by the end of January. You have to enter ALL of your W-2's on the same tax return. Some W-2's may be available for import later in January.
https://ttlc.intuit.com/questions/1934390-how-do-i-import-my-W-2
https://ttlc.intuit.com/questions/2588751-why-can-t-i-import-my-w-2
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**