Borrowed from "Editing a Course"
To add or alter activities or resources you will need to TURN EDITING ON. You can do this by pressing the button at the top right of the course homepage or following the turn editing on link in the administration block. You can turn editing off again by pressing the button or the admin block link again (now renamed turn editing off)
When you begin editing, you will see the following icons. The explanations for each button was taken from Moodle.org
This is the edit icon, if this appears next to an activity or resource, edit will allow you to alter / change / update that resource or activity
This is the help icon, which when clicked, will bring up a window with helpful information
This is the open-eye icon. When the eye is open, that particular item will be visible to all students. Click the eye to close.
This is the closed-eye icon. When the eye is closed, that particular item is hidden from students. Click the eye to open.
This is the indent left icon. If you click this button, it will indent the item to the left.
This is the indent right icon. If you click this button, it will indent the item to the right.
This icon allows you to place course elements anywhere designated by the box below. If you see the box below, then you can move a course element to that spot
This icon appears when you are moving a course element. Each one of these icons represents where you can place a course element
This icon permanently deletes a course element
When this icon is clicked, it highlights the section as the current section
This icon will hide all other sections
This icon will redisplay / expand all sections