How do I finish my presentation?

It all depends on that presentation. Did you take notes on it or what. Search whatever it is and write down the important details. Don't make it to wordy if you are looking for a quick presentation. Make bullet points and have good headings.
Sorry if this wasn't too helpful. I might have given a different response if you were specific. That's right, you need to be detailed, so the audience would understand what you are saying.