How can I import w2 if I've already begun adding it manually

You can simply just clear your first form and restart from the beginning and just add your employer ID # and turbotax should be able to find all ur info with ur name 

​​​​​​You can delete the started W-2 and then import a new W-2 by following the steps below:

1. Login to your TurboTax Account 
2. Click "Work on other tax breaks"
3. Click on the Search box on the top right and type “W2”
4. Click on “Jump to W2” and you should see the “Here's your W-2 info” screen
5. Click “Trash icon” next to the W-2 you wish to delete.
6. Click on "Add a W-2" button and follow the steps to import your W-2