Get your taxes done using TurboTax

This is driving me crazy on how to fill it out in Turbo Tax.  Like the mortgage, do we both claim it, but input half of it or does the sheet at the end make the adjustments?  I mean do I go along filling it all out like it is separate and the adjustment will fix it?  There are also only three, spaces on form 8958.  I assumed in amount allocated to each spouse you just split it in two, but from your example below??  Is the allocation below, like add 300 the spouse allocation.  Really understood the concepts, but am confused in Turbo tax.