How did you import it? With Import manager? If you have TFT just copy the skill itself, from Object Editor into your own Object Editor. You will mostly probably need to copy all the triggers that affect the spell (they should be in a folder or something...). First, once you have loaded your map go to File - Preferences and have checked the "Automatically create unknown variables while pasting trigger data". Then copy-paste the whole folder for the spell or all the triggers/JASS enchanchements affecting the spell into your trigger editor. Voila! You have imported the skill.