You can enter several W2s into TurboTax.  After you enter the first one, you will have the option to "Add another W2" using the blue hyperlink. (see image attached)

You can go directly to the area to enter your W2 in TurboTax online 

1. Sign into your account and select your current return.

2. Select  My Account on the top right and then select Tools

3. Select Topic Search (see attached image)

4. Search for W2 and select Go

5. Follow the interview to enter your information.

You can go directly to enter the information using these steps either TurboTax desktop.

1. Search box in the upper right

2. Search for W2

3. Jump to W2

4. Edit the W2 for change