Login to your website admin panel: https://YOUR_SITEBUILDER_USERNAME.musicprosite.com/login
Hover over the page that you want to edit to reveal the menu
Click on Edit
Scroll to the section that you wish to edit
Hover over the element and click on the pencil icon
In the popup window, make your edits and click Save Changes.
Scroll up and click on Update in the right column
in Site Builder