Get your taxes done using TurboTax

When clicking on the "Flags" icon in the upper right corner of a page, the first 2 items that I previously flagged are appropriately shown, but when I attempt to flag an additional  item, the button showing "Flag This Topic" is grayed out, and won't allow me to add a flag on a new item.  I am using TT Deluxe.   I am at the 1099-B section of filling out TurboTax.

What should I do to correct this problem?

Thanks for your help.