There are different kinds of pages:
1. Text pages for writing things and displaying slideshows(e.g. wedding page)
2. Product Pages for showing products for purchase(e.g. spring flowers)
If you want to add a new text page, you can do this in Admin > Website > Edit Pages > New Page. After creating a new page you can add text by clicking on the Content tab on the left menu.
If you want to add a product page you do this in Admin > Products > Website Products/Categories > Add Category. You can drag the newly created category around with your mouse to different categories like Flowers or Occasions. If you want it to be a top level category you can drag it into the main category Default Category.