1. Click on "My Media" in the left navigation menu.
   

    

2. Find the video you want to edit. Click on the "pencil" edit icon.
   

    

3. Click "Launch Editor".
   

    

Here you will have a simple editor where you can trim the start/end or cut segments from the video.

If you want a more robust editing tool you will need to download the video and open it in your preferred editor then reupload.

Refer to this guide for downloading videos: https://helpdesk.lsus.edu/support/solutions/articles/2000048893-how-to-download-kaltura-videos-for-teachers-editors

Refer to this guide for uploading videos: https://helpdesk.lsus.edu/support/solutions/articles/2000048991