Hi there France Leclerc , thank you for submitting to our Ucraft Forum!
Navigate to your Dashboard and access the Site Settings App to change the Site Name. There you will see the corresponding field for changing the name.
To set the rest up, navigate to the SEO App located on your Dashboard. You'll then see all of the pages you created. To make sure all your pages are optimized, hover your cursor over a page and press Edit. The one in your screenshot is the Homepage.
You'll find the structure of your pages and be able to add Titles and Descriptions and upload Social Images, which appear when you share your page on different social media platforms.