Have 32 bit and cannot use Turbotax how to update to  64 bit? Thank you

How do I update my MacBook Pro from 32 bits to 64 bits?  And what are bits?  Thank you

You give no information about what specific Macbook Pro you are using.
http://support.apple.com/kb/ht3773
Intel Core 2 Duo processor or newer, your computer is a 64 bit.
In terminal you can determine 32 or 64bit:  copy and paste:
ioreg -l -p IODeviceTree | awk -F'"' '/firmware-abi/{print $4}'

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