The correct answer to this open question is the following.
Unfortunately, you did not attach the documents. So we do not know the topic of the document or the skill included in the document.
However, trying to help you, we can comment on the following general terms.
When you are trying to solve a disagreement, one of the most important skills is to listen to the other person's concern or perspective, in order to understand what is the problem form his/her point of view, so you can have a clear idea about the subject that created the disagreement on the first place.
So when confronting the other individual, you keep calm and thoughtfully listen to him/her. Remember to be in a private, quiet place. Then both acknowledge the existence of a problem that needs to be resolved. Understand the concerns and perspectives of the other person. Agree on a solution and take action.