In the file area where you submitted the assignment it is now possible to retrieve someone else's submission to give them feedback, make sure you choose the name that come after yours alphabetically (if you are last in the alphabet then take the first in the alphabet). If there is no report for the name directly below yours then take the next name down that has a report submitted.
You can send the email by going to the participants list (if an email is not shown it is just because it has been hidden for privacy purposes, you can still send an email to the person through the list function).
Again remember to CC (Dold Kopia) to Sdesign@csduppsala.uu.se so that we can mark off that you have done the feedback assignment.