That's a great question, I am happy to help you with this.
1. Go to "Federal Taxes" at the top of the screen
2. Select the "Wages & Income" sub-tab
3. Select "Start/Revisit" next to "Wages and Salaries"
4. Select "Edit" next to the W-2 you had the tips for
5. Continue until you get to the screen titled "Do any of these uncommon situations apply to this W-2?". Make sure the "Unreported tips" box is checked then Continue
6. On the "Enter Your Tips" screen enter the amount in the box then Continue to save