On the "Add & Move Pages" tab, select where you want to create the new page. Click on a page in your site outline to navigate deeper. Every level in your site has an "Add new page..." button to the right of the last page in that level. For instance, if you wanted to add a main category, select the home page and then click the "Add new page..." button at the end of the list of main category pages.
You can edit a page in your site by either navigating through your site just as you would normally browse it on the web from the "Edit Your Site" tab, or from the "Add & Move Pages" tab. From the "Add & Move Pages" tab, double-click on the page you want to edit or select it and click the "Edit this page..." button in the page info at the bottom. This will take you to that page in your site under the "Edit Your Site" tab.
To rename an existing page, you can use the "Page Options" drop down menu next to its name when in the "Edit Your Site" tab, or go to the "Add & Move Pages" tab. From here you need to select the page you want to rename and click on the "Rename this page..." link in the page info at the bottom, underneath the current name of the page.
To delete a page, you can use the "Page Options" drop down menu next to its name when in the "Edit Your Site" tab, or go to the "Add & Move Pages" tab. From here you need to select the page you want to delete by clicking on it, and then click on the "Delete this page..." link in the page info at the bottom. You'll be asked to confirm that you want to delete the page.
Your site must have at least a home page. If you want to delete your site, go to the ACCOUNT tab.
Click on the page you want to move in the "Add & Move Pages" tab, and use the side to side arrows in the page info area at the bottom to reorder it among the other pages within that same level, or click "Choose Location..." to move it to another level within in your site. (You may need to navigate within your site by clicking on various pages to find the new location you want.) You will see a red target icon followed by the words "Move to here..." after the last page in each level. Click on "Move to here..." to move your page to that location in your site.