edublogs clean home page and featured images

i have uploaded a featured image

1) it does not show,
-in wp-admin i get the option to update thumbnail,
-i select the area i want
-i save thumbnail and save setting
- text changes show but no image on home page
- i tried only added an image o featured box 2 and got a message that the image was wronf size - i used 200x100 and do not get an option to select thumb

2) how do you change the featuted image - should therse be going into media library anyway?