The CMS is capable of managing multiple websites, so if you have access to more than one you will see a list of them when you login. At any time, you can select the Sites tab to come back to this list. (If you only have one site, you will be taken directly to that site instead.)
To edit a site, select the appropriate one from the list. This will take you to the Pages page, where a list of pages you can edit will be shown.
Once you’ve selected a site for editing, or if you only have one website, you will be taken to the Pages page. This section shows all the pages on your site that you are able to edit. To edit a page, select its label from the list.