Hi checkyourmirrors!
I was having the same issue, which is how I found this topic thread. But I just typed "1040" into the box where it gives you the option to type the name of the tax form. Then I clicked Next at the bottom of the screen and the following screen shows more options related to 1040, including an option for "Estimated 1040ES"
So in conclusion, put "1040" on the first screen and then click next and you will see the option you are looking for.
Blessings!
Christi
