When you're on the first form, click the + sign to add another form.

there isn't a plus sign for social security benefits. My client has five that needs entered. 

See your other thread ... and having two with the same question isn't necessary.

5? Are you absolutely, positively satisfied that they all belong to the taxpayers and none belong to the dependents? 

And looky at what pops up when you click the entry box!

No + on the tab? Try clicking on the box.