You will need 3 things to change or update images/text on your website:

1. FTP program with logon information to your server, we recommend using filezilla, http://filezilla-project.org/.
2. Download your current html documents and/or images.
3. Upload the updated images or html files from your computer to the server.

Now if you got lost we will be posting some screen shots to show the above in action shortly.