Ideally, you were introduced by a presenter who has also given some interesting background information about you to the audience. However, it always makes sense to leave nothing to chance here and, on the one hand, to discuss your introduction with the presenter upfront and, on the other hand, to include the most important points in your speech. I would always start with an introduction into the topic to get the audience interested and then introduce myself. The best way to find the right introduction is to read this article.