1)

Click the floating plus icon and select "Image Step"

2)

Click on "Take Snapshot"

3)

Enter a title, description and click "Save"

4)

If you want to perform any activity on the screen and want that screen to be captured at a certain delay, you can use the delay capture feature

There are two delay capture options - 5 and 10 seconds

5)

Either option when selected, starts a countdown for you to perform the particular task.
You have to make your best guess for how much time you will need

6)

Your screen will be captured after the delay!