Those numbers are not entered by you, they are entered by TurboTax based on the information you entered for your dependents on your return. If those numbers need to change, the information for your dependents must change.
For example, line 4 represents the number of qualifying children under the age of 17 shown on your return. If there is a zero on that line, then you did not have any qualifying children on your return under the age of 17. You cannot simply change that number without changing the information about your qualifying children.