One way to remember the stories you prepared for the interview is to create a storyboard.
For example, write down the situation, task, action, and result for each story on a separate index card or piece of paper. Then, arrange the cards in order so that you can easily recall each story.
Another way to remember your stories is to practice telling them out loud. This will help to solidify the stories in your mind and make it easier to recall them when you need to.
Finally, try to relax and be yourself during the interview. The more comfortable you are, the more likely you are to remember the stories you prepared.