I have seen your question for a few days and I am not familiar with the "contribution" section.
Is it possible that you mean the "significance of the study"? This should be at the end of your introduction, after you have stated your general goal and specific research questions. You should state why this study makes a contribution to the academic literature and why the subject matter and topic of inquiry is important.
Note that you are NOT reporting findings but rather stating why the SUBJECT was worthy of study.
See my outline of a research paper at: https://www.researchgate.net/publication/267509823_Research_Study_Manuscript_Outline
Conference Paper Research Study Manuscript Outline