Can I correct the last year's amount of the carryover foreign taxes directly on Line 1 of the Sch.B of the Form 1116?

I realize that on the Schedule B of Form 1116: the carryover foreign tax credits (due to excess of  foreign taxes) for the previous year are wrong.
Can I just correct them on this year return  ?
Should I alter directly the amount on the line 1 of the Schedule B of form 1116?
Or should I use lines 2 b, c, d, ... ?
(everything else on my last year's return is correct...)
Thank you.