When I am entering reasons for withdrawing from my 401k, do I need to put the amount of money I spent?

It is not going to ask you what you did with the money.   You are going to get a 1099R for the money you took out of your retirement account.  The 1099R will show how much you took out and how much tax was withheld.  You will enter that 1099R into your tax return.   They usually send out 1099R's in late January to mid-February.  Sometimes you have to go to their website to get them.

To enter your retirement income, Go to  Federal> Wages and Income>Retirement Plans and Social Security>IRA  401 k) Pension Plan Withdrawals to enter your 1099R.

It might ask why to see if you have an exception to the 10% Early Withdrawal Penalty but I don't think you need to enter the amount.

For exceptions to the early-distribution penalty it is necessary to enter the amount that qualifies for the particular exception.  Not all of a distribution necessarily qualifies for an exception.