Idiots guide to issues with updating pages

Right now I am despising wordpress which is a consistent thing. So tempted to scrap my site and go to Wix or something. When I click edit page, it takes me to a HOME page wthat says Welcome to your site! This is your home page, which is what most visitors will see when they come to your site for the first time. It’s as if my page doesnt exist. What is going on? It feels like wordpress is from 1982 compared to every other option but I want to stay so can someone talk to me like I am 90 years old and tell me step by step what is happening? ??

The page I need help with: [log in to see the link]