This is the time when you establish a rapport with your audience. During this time, try to speak slowly and calmly. You should perhaps learn your introduction by heart. After a few moments, you will relax and gain confidence. You need to build a warm and friendly relationship with your audience.
Enthusiasm is contagious.
If you are enthusiastic your audience will be enthusiastic too. And be careful to establish eye contact with each member of your audience. Each person should feel that you are speaking directly to him or her. This means that you must look at each person in turn - in as natural a way as possible. This will also give you the opportunity to detect signs of boredom, disinterest or even disagreement, allowing you to modify your presentation as appropriate.