To edit your website, you can go to the Website symbol in 

To edit the HTML of your website - select File Manager

To add or edit News Posts - select Content Editor

If editing content pages of your website, in File Manager go to Templates Folder

This folder contains a list of your website pages: 

Select a page: 

On the menu bar - select Do with selected > Open

This will open the HTML to the page. Once edited click save.  

Back on the main website screen, click update now: 

Select Quick if only text/content changes, if adding images/files, or layout change - select Full (Note that Full will take down your website for 2-3 minutes)

Please note that any website changes that involve that breaking the website design, may involve a charge if you require to resolve.