Navigate to your experiment. The experiment view is shown, including a button labelled "ADD NEW SUBJECT". Click this button.
Fill in the form (all fields). Click the "Files" tab to add folder or files from your PC. Click the black button: "ADD FOLDER" or ADD FILES" and select files from your PC.
Finally, click the blue button: "SAVE". A view of the new subject is displayed, with a green notification message saying: "Complex subject was successfully created."