How do I Apply foreign tax credits on form 1116 rather than SCH A using the online input?

when you entered the dividends you should have come to the foreign dividend credit line 7 where you enter the amount

then there's a page that asks for the amount of foreign dividends and the source which must be completed

eventually, you need to reach the Estimated and Other Taxes Paid section under deductions and credits, there you'll find a link for foreign taxes (click update or start) 

eventually you'll reach a page that asks if you want the deduction or credit so select credit.

there's a page showing the foreign source - click report income and check the appropriate boxes on the next page

finally, on the next page enter the amount of the foreign source dividends 

eventually, you'll reach another page to identify the category - dividends are passive 

there will be other pages where youu'll need to supply answers