I need help on Supernova

Please I need your help. I just installed the supernova theme
1) 1st I change my landing page from “Sample Page” to “Home” after doing that the landing page became independent I mean not displaying as one of the pages on the page navigation option and the “Home” is now showing like a page and not the landing page please how do I correct this? When the website is visited the page which is not on the page navigation is displayed

2) How do I write or edit words on the slider?

3) Please is latest blog latest post if it is how do I edit the word to latest post and if it is not how do I make it display latest post?

4) Please how do I make a sub page like you made for the “Sample” in the demo?

Thanks for your help.

The site https://www.panoramatoday.com