How do I enter my prior year alternative minimum tax credit carryover

You may report your tax credit carryforward from Form 8801 under Deductions & Credits >> Estimates and Other Taxes Paid >> Credit for AMT Paid in Prior Year

Or go to the Find box at the top right side of the TurboTax header. Type in "8801", hit Enter, and click on  "jump to 8801" to go directly to the beginning of this topic.