First, let's talk about basic row settings. To edit a row's settings, click on it's pencil (similar to how you edit elements within rows).
All rows should have the "Is this a full width row?" checked. Additionally, you can adjust the bottom and top padding numbers (these are in pixels), but generally, you want them set to zero.
One of the exceptions to that is when you create a colored headline.
To create a colored headline, you must first create a new row. Once you've created the row, you'll need to go into the row settings and make sure you've checked that it is a full width row.
Next, you'll want to set the background color. Usually this is to one of the colors I'll give you in HEX code to match the color scheme of the page.
Finally, set the top and bottom padding to 21px.
Once that's done, you're going to create the headline using the same directions in the headline section with two important differences.
First, the text will likely need to be white (#FFF). Second, you will set your bottom padding to be BLANK. This ensures that the space at the top and bottom of the headline block is even.
A Note About Text Boxes
Generally, I like each paragraph to bee in it's own text box so that I can easily drag them around and move them if I need to edit your work.
I'll explain why in the next section on multi column rows.