This tutorial assumes you've already got a script with properties set up.
First, you've got to get back to the CK. Exit any script editor you may have open, provided you've compiled your script. Find the object that your script is on, and navigate to the big Properties button by your script. Click it hard. Or softly. Your choice, really.
Our other property, BleakFallsBarrow, is not the name of an actual ObjectReference in the game. So we'll have to manually fill it. Click on your property that you want to manually fill, and choose the right entry from the dropdown:
Once you've selected the right entry, press OK to close the Properties window. Your property has been filled. Repeat as necessary for all properties.