Many lecturers use the Turnitin Plagiarism checker to determine whether referencing has been correctly done and to guard against plagiarism. If your lecturer wishes you to use Turnitin they may request you submit to Turnitin in different ways.
Directly to Turnitin website
Via an eCampus Assignment
Most lecturers will enable Turnitin in a eCampus Assignment. Please see these Turnitin Instructions for using Turnitin in eCampus.