You can edit this text area to say whatever you like. Simply login to your Control Panel and visit the Manage > Pages section. You will then see a list of all the pages you can edit. Just click the Edit link next to the page you want to customise.
The Support section of the control panel is designed to give you and your webstore a helping hand, should you need it. It covers every aspect of the Control Panel so, if you need any pointers, feel free to take a look.
If you have just created your online shop, it may still contain a few dummy products and categories, purely for display purposes. Feel free to remove these before starting to add your own range of products. Just visit the Manage > Products and the Manage > Categories sections of the Control Panel to remove them.