In order to replace a background image when the question is already active, we must:

1. First of all see that we are connected, and move on to the management interface.

2. We must then enter the management menu for the question settings.

3. In the settings we scroll down until we see under the heading 'Visibility', the existing image.

4. On the image side will appear a cloud sign, which we will click on and we can select an image from the system or upload one from our computer.