I am unable to modify my Form 2210 online. please assist.

[srini-paddu]

I am unable to edit my Form 2210 to enter any tax withheld amounts

[KeshaH]

The tax withheld amounts come over from the forms that included withholding. By default, withholding is treated as paid equally throughout the year. If you are trying to make the election to include withholding in the period it was paid instead, you'll need to choose Yes on the screen that asks if you'd like to make that election. On the next screen, you can enter the withholding by period.