Open (continue) your return in
TurboTax if you don't already have it open.
Inside TurboTax, search
for W-2 in the search box in the upper right-hand of
the TurboTax screen (upper- or lower-case, with or without the dash) and
then select the Jump to W-2 link in the search results.
Proceed to the Here's your
W-2 info and select add another W-2