After you listen to a recording, you may realize that you have more to say about it. Let's continue working with our recorded sound:
Click on the recording at the point where you want to insert a new sound. The vertical line in the following screenshot shows where the new sound will be added. Note that the screenshot shows that it's possible to add a new recording in the middle of an existing sound.
Then, click on the record button and speak.
When you're finished, click on the stop button. The newly recorded section will be highlighted when you click on the stop button, as seen in the following screenshot:
To preview the new recording, click on the play button. You can keep deleting and recording until you're satisfied with the results.