Simply go to the individual who has had a DNA test done and double click to open up their "Edit Individual" screen. Once there, click on the "More" tab at the top:
Now click on the button labeled "DNA Markers:
Simply enter the results in the appropriate locations and it is now saved for future comparisons. This information can be part of the "Individual Summary" report.
Here you can view the results in a report. Take advantage of this and many other features in Ancestral Quest.