The easiest way:
1. Open the page you don't need.
2. Rest mouse cursor at one of the words.
3. Hold Ctrl key then press A. Release keys. Now whole page will be high-lighted in blue.
4. Press Delete key on key board. This page will be removed permanently.
5. Go to page one and make sure it relates seamlessly to the following page.
6. When finished, hit Save.