Page canot be found

I have a site under construction. I’m new to WP and html, I wanted to have a menu button on the site what visitors can click on to return to main page.
I use latest stallion theme. I went “Customize”, “Menus”, Create menu. I gave a name: “home”. Theme location window, “your theme supports 4 menus. select which menu appears in each location”. I chose primary navigation, type in home. Next Custom links, URL, I gave my site address.
The problem is, now the page can’t be found. even I deleted the menu, page still can’t be found. How can I correct this?
Thanks for your help!