On the 1040, it’s line 37
on the 1040A, it’s line 21
on the 1040EZ, it’s line 4
plus you should have form 8862 filled in
On the new tax forms that were implemented last year, Earned Income Credit is listed on line 18a.
Here is more information about the changes that the IRS has made to the 1040 forms last year:
https://blog.turbotax.intuit.com/tax-reform/irs-announces-they-are-working-on-a-new-1040-tax-form-intuit-turbotax-has-got-you-covered-41221/
If you've already filed your return you can save as a .pdf file to view or print following these instructions:
https://ttlc.intuit.com/community/printing/help/troubleshoot-printing-issues/00/25958
You can view or print your in-progress 2019 Tax returns by following these instructions:
https://ttlc.intuit.com/community/my-tax-return/help/how-do-i-view-or-print-my-in-progress-return-or-view-a-summary-or-specific-line-on-my-return/01/27425#M2178