if you dont know how to create variables, go to the variables tab via trigger editor (CTRL + b) and create the variables (using same variable types also) that are used within the trigger based spell you're trying to import.
Open the original map you're exporting the trigger from and open the variable table in that trigger editor, then select all variables and copy them, then paste them in your own trigger.
WARNING: if you're importing a JASS based spell and don't know how JASS works I suggest you read some of the tutorials on the forum.