Once you have selected a layout for your email you can add content.
Under First select a section, click on the section where you want to add content
Click on any striped area to add text there
If you decide a different layout would work better, click Change Layout button on the bottom left.
Preview your email
Click Preview Email on the top right to get an idea of how your email will look on a computer or phone.
When you're satisfied with your newsletter content, click Continue to add recipients and the subject.