How do i enter my pre paid tax amount for 2018

[IreneS]

If you mean the estimated tax payments you made quarterly, please follow these steps:

1. Click on Federal >  Deductions & Credits
2. In the Estimates and Other Taxes Paid section, click on the Start/Update box next to Estimated Tax Payments. 
3. On the next screen, click the Start/Revisit box next to the type of tax payment (Federal, State, Local).  
4. Enter your payment(s) on the next screen, How much did you pay in federal [or state or local] estimated taxes? Select the locality from the drop-down list and enter the amount paid in the box.

 Your estimated payments will show up on line 66 of form 1040 (Schedule 5)