Hi there,

Each of these images can be edited on the individual page.

Let's take the "Weed Control & Fertilization" image for example. You can edit that image by these steps:

1. Go to the "Pages" admin tab

2. Edit the "Weed Control & Fertilization" page

3. The placeholder image can be changed at the right side of the page at the "Featured Image" field. The location of this field can be seen in the following article:

Change the QT: Featured Page widget image and text

You can repeat these steps for the other images.

Hope this helps.