For your 1099 entry, click on the "magnifying glass/Search" icon on the top row of your screen, enter "1099(letter(s) on your 1099)" in the search window, and then click on the "Jump to 1099(letter(s) on your 1099)" link to enter your 1099.
Continue through all the screens for 1099 entry, to make sure you answered all the questions in that section.
If you have already filed your return and it has been accepted by the IRS, you will need to file an amended return to add your 1099.