Step 1. Add a video
Look for the video you want to rotate using the "+Video" button or drag-'n-drop option.
Step 2. Rotate your video
Click "Edit/Play" button on the right. Click the button "Rotate 90° CCW" or "Rotate 90° CW" to turn your video left or right respectively. Click "Ok".
Step 3. Save the rotated video
To save the changes, you have to convert the video. Choose a format (better the same as the original), preset "Same as source", and click "Convert".
Watch on YouTube our video guide "How to rotate video".