Changes in Content Pages

I want to make changes in our content pages in our root categories. (Example attached)

How do I insert my new pages? And make subsequent changes and updates?

I also need a “General Practitioner” to help with everything from “colds” to “major surgery”. (translation–small questions to major site changes, additions:blogs,etc., and help in times of emergencies). We are novices but want to learn to maximize our CSCart.

site is :

Thanks, Diana