When you have registered, please check your profile under "Edit profile" and make sure that you fill out the DTU card number. 
This is the 8-10 diggest number, not the DTUIXXX. 
Click "update profile" and that will activate your card.  
Choose this if you ordered using "No attachment to DTU".
This is for people that do not work, or are studying at DTU. 
Payment is 350DKK + transaction fees.
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DTU Sport