How to add CMS pages in PrestaShop
In PrestaShop you can add custom pages with any information of your choice. To do this log in to the backend of your store, click on the Tools tab and then on the CMS sub-tab. Click on the Add a new page button. This will display the options for the new page. Use the built-in text editor to type the page content, type the title, description and keywords in the respective "meta" fields, change the friendly URL if necessary, choose whether you want the page to be enabled or not, and save it.
If the page is enabled, customers will be able to access it by using directly its URL address or through the sitemap. You can make it more easily accessible by adding a link to it on the homepage of your store. You can do this by using the module CMS Block. You can use this module to provide a link to a CMS page by adding the link to any of the blocks displayed by the module on the frontend of the shop.
To do this click on the Modules tab of your store's backend. Then open the Front Office Features section, find the module CMS Block and click on its Configure button. In the full PrestaShop installation mode the module displays a block in the left column of the frontend and also some links in the footer of the site. You can configure the options of the module so that a link to any of the CMS pages is shown as part of the blocks displayed by the module.
For some more details and screenshots you can also check out the tutorial on adding and managing CMS pages in PrestaShop.