Check out the Drupal installation video tutorial:
Drupal Installation Detailed Tutorial
Once logged into Fantastico, you will see a list of scripts in the left column of the the page.
- Look for 'Content management' and click on 'Drupal'.
- Now click on 'New Installation'.
- Choose the Drupal installation directory - if you want Drupal to be accessible at http://yourdomainname.com, leave the installation directory field empty.
- If you want Drupal to be accessible at http://yourdomainname.com/drupal, enter drupal as an installation directory. Proceed using the on-screen instructions.
If you need to install Drupal manually, you can follow the manual installation instructions here.