Once you're happy with how to site looks we will provide you with a Password to your CMS system. You will be able to edit your site from any computer in the world.
We can provide some lesson on the functionality of your site of here are some resources that will help. For WordPress, owners reading some articles at www.worpress.com/start
For Drupal owners, we recommend reading www.drupal.org/node/877140.
Remeber you can always contact us for clarification.