I'm sorry I don't understand what you are saying about your W2 not showing. The total withholding of all the W2s box 2 will be on your 1040 return line 25a. Add up all the W2 box 2. If you think it's wrong then delete the W2 and reenter it.
Before filing you can preview the 1040 or print the whole return
https://ttlc.intuit.com/community/accessing/help/how-do-i-preview-my-turbotax-online-return-before-f...
