You can print them them take it to the counter and they will scan them and give you a sticker to wear for the day
I bought them online and then I went to the counter when we got there and they took care of everything. I believe there was an email though. It's been almost a year since I did that so I can't quite remember.
If you plan to do other things on a visit to Seattle I'd recommend the city pass. Buy it at any of the attractions and use within 9 days.
Cant help with your question, but as visitors from Australia we really enjoyed the visit to the Museum. We loved Seattle.
You could call and ask maybe
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