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
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