My husband traveled for his employer and does not get reimbursed for it. Where can I enter the receipts?

You are not able to deduct unreimbursed employment expenses on your federal return.  If you live in a state that allows the deduction, you can enter in the Deductions & Credits section under Job Related Expenses.

Sorry, if he is a W-2 wage employee, any employee business expenses are not deductible on a federal tax return due to the tax code changes in effect for tax years 2018 thru 2025.