The following is a quick guide for updating the website contents,
a full user guide is available at the Drupal website at
  Drupal content management system End User guide

1. Create an admin account

To change content:
1. Log in with your username and password
2. Browse to the page you wish to change
3. Click the 'Edit' button
4. Make your changes
5. Don't forget to save the changes

To add content:
1. Log in with your username and password
2. Click the 'create content' link
3. Select the content type (page if in doubt)
4. Type in the Title and content detail
5. Save your new work.
That's it you have just published something on the web.!

To add images:

1. Upload an Image to the server.
Before we can use an image we must upload it to the webserver:

CreateContent – Image
enter a Title, Choose an image gallery, then click Browse...
select the file you want to upload,
enter a description
click submit

You have uploaded an image to the website !
We can now use the image in a webpage.......:

2. Use an Uploaded Image in a Blog Posting

CreateContent – Blog
enter a Title, Choose where the posting is to appear,
below the 'Body' text box click the 'picture' icon
you will then see all the pictures available on the server, select one of them, add words as required, finally don't forget to 'Submit'