Thanks for reaching out and sorry for the late reply
As @cmarchan kindly noted, the template has different reusable elements which you can find in the Reusable elements section:
To be able to edit them, do a double-click on such element or find it in the special section, near the Pages section.
Some elements in the template are hidden from view on the editor and the page load. To make them visible in the editor, please find the Element tree section and press the “eye” icon:
In the example of the Header reusable element, all its elements are hidden in the editor. Please open the Element tree and expand nesting groups:
When you click on some group within the element tree, you are “opening” its inner elements and make them visible in the editor.
I suppose this video will be useful for you. It should help you understand the Bubble basics:
Besides, some useful pieces of information you can find in Bubble Manuals:
I hope it helps.