There are two different ways to add content
The first is by double-clicking on any blank spot of the site, which will bring up a circular menu and selecting the type of content you want to add
The second is by clicking on "Insert" in the top of the right sidebar and selecting the type of content you want to add
For this tutorial, we are going to click the two T's to add a text box
Click in the text box to start typing
The menu at the top of the text box had formatting options
The blue dots on the side of the text box allows you to change the size of it
In this example, I have changed the title of this page, changed the size of the text box, and added a "Google Sites" image
Go here to learn how to create an additional page