Line 18 is a calculated entry so it cannot be overridden. It is the amount that is based on your taxable income reported in Box 15 of your 1040, which is your adjusted gross income minus your standard/itemized adjustment. This is something that you would never adjust yourself unless you add or delete an income item in your return.
I suspect that you may be looking for a bigger credit but according to the IRS, they state that Your foreign tax credit cannot be more than your total U.S. tax liability multiplied by a fraction. The numerator of the fraction is your taxable income from sources outside the United States. The denominator is your total taxable income from U.S. and foreign sources.
This determines the amount of foreign tax credit you may use for the year. This is why you receive a partial credit versus the full credit. If you have foreign taxes available for credit but you cannot use them because of the foreign tax credit limit, you may be able to carry them back to the previous tax year and forward to the next 10 tax years.
@TaxDavey
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