Where do I enter a 401K Retirement distribution that was rolled over to another 401K account?

You should have received a Form 1099-R for the distribution.  Where asked what you did with the money just indicate moved it to another retirement account.

To enter, edit or delete a form 1099-R -

• Click on Federal Taxes (Personal using Home and Business)
• Click on Wages and Income (Personal Income using Home and Business)
• Click on I'll choose what I work on (if shown)
• Scroll down to Retirement Plans and Social Security
• On IRA, 401(k), Pension Plan Withdrawals (1099-R), click the start or update button

Or enter 1099-r in the Search box located in the upper right of the program screen. Click on Jump to 1099-R