To edit the welcome text on the home page: Edit in sidebar > Static Page > "Edit a site-level static page" > select "news"
The functionality to create the Help pages is called "static" pages in Open Repository/DSpace. They can be created or edited by going to "+" or the pencil icon in the admin menu.
Word and HTML files of the current Help pages and the ones we were using in OR5 are located at:
I:\Help pages and home page text
Hints:
To edit the introductory text for each community and collection: from the 3-dot menu, use Edit Community or Edit Collection while on the page
Currently introductory text must be formatted in HTML.