First, those additional boxes will show up as you continue to enter information (be sure to select the link to 'Add additional information').
Second, some additional information. Did you originally acquire Brighthouse as part of a spin-off from METLife?
If you held METLife stock prior to 2000, you should be aware that in February 2000, METLife converted to a "Demutualized" stock issue. The IRS determined that the 'cost basis' of those Demutualized shares should be treated as zero. http://www.costbasis.com/stocks/demutualizationshares.html