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Note that Copy density reference to clipboard is available in the File dropdown menu on the right.
To load in your density reference file into Imatest:
Load your image(s) into Imatest
Start your analysis
Proceed through settings & ROI selection
In the interactive results window, select Density CSV file (one value per line) in the Ref dropdown, as shown in the image below. This will open a browser for you to select your reference file.
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See Also
Colorcheck Reference File (legacy module: Color/Tone is recommended for new work)
Measuring Test Chart Patches with a Spectrophotometer for details about how to create a reference file using measurements from an instrument.