If the divorce or separation decree was finalized after 12/31/2018 you do not enter alimony paid.
Otherwise -
To enter alimony paid -
Or enter alimony paid in the Search box located in the upper right of the program screen. Click on Jump to alimony paid
However, if you were referring to receiving an alimony payment -
To enter Alimony payments received -
Or enter alimony received in the Search box located in the upper right of the program screen. Click on Jump to alimony received
Alimonies for divorces and separations finalized after 2018 are no longer taxable or deductible.