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To change your page header, click on the text box and adjust your text as needed. You can use the blue circles to adjust the width of any text box or object in Google Sites.
There are two ways to add text to your Google Site. The first way is to click on the TEXT button on the upper right. The second way is to double-click anywhere on the canvas (webpage) and click TEXT. From this point, you can type inside of your text box and move the box where you want on the page.
There are several ways to add images to your Google Site. One of them is to simply drag an image from your desktop onto your canvas. Another way is to click on an image in Chrome and drag it into the canvas. Both of these methods will work fine. In this example, we will use the IMAGE option on the top right and locate an image from our Google Drive or Google Photos.
These two videos cover all of the basic tools you will need to create your Google Site.