The left side navigation bar can be customized to better fit your needs.
To change the name of a page:

1) Click on the green edit button to the left of the page title.

2) Replace the existing title with your new title

3) Click the "Save" Button.The new title will appear in your Left Side navigation list.
To move the position of a subject:1) Click on the

to the right of the page title.
2) Hold and drag the page (slowly) to the new location.