1)

Click the "Add" icon

2)

Select "Add Screencast"

3)

Give permission to MyGuide by clicking "Allow"

4)

Choose which active screen you want to share

5)

The screensharing has been started, click "Stop sharing" when you are done

6)

You can upload a thumbnail for the video

Also, you have to give it a name 

7)

Click "Submit"

8)

Your step will be created soon, click OK

9)

Your step has been created!