You just:

1. create a folder within Unclutter (or create it wherever you want and then move it to Unclutter)
2. from the services menu go to “Folder Actions Setup”
3. choose the script you want to attach to the folder: for example “Devonthink – Import & Delete.scpt” (and to another folder you could attach for example the “Devonthink – Import, OCR & Delete.scpt” script.)

As simple as that.