My first thought was you owe less than $1,000 or paid 100% of last year's tax - so no penalty. It sounds like you received a letter with a $150 penalty from the state which is a big deal. In that case, you do want to annualize the income. You will need to use the desktop version to force open the annualization form. Since you have already filed, select that you want to amend. Choose that you need to use desktop. See instructions here.
You do not want to amend the whole state return. You just need the annualized income to send back with the letter you received. Note that you disagree with their penalty using the annualized method.
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