If you are either in the Design or Content tool, you may desire to move to the other tool for the page you are on. Use these tips to aid your workflow:
When you are in the Design tool and need to edit the content of that page, use the pencil icon, always found in the top righthand corner to switch to the Content tool
To easily switch to the Design tool from the Content tool, select the blue paint roller "Design this page" button
Note: These links are the easiest and quickest way to switch between the two tools.