Unfortunately, the manual on
http://www.korg.com/us/products/tuners/ga_40/
indicates that 12 string is not supported.
The owners manual can be downloaded at
http://i.korg.com/uploads/Support/GA40_EFG1_633661472559800000.pdf
The YouTube tutorial is at
https://www.youtube.com/watch?v=Of4CRajvq0E
with a 12 string, you can often tune the octave until the tuner sees the matching note. It won't see the correct string number, but an A note is an A note, whether or not it's an octave higher.
Hope that this helps.
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