The left side of the page contains page sections, also referred to as "blocks." Each page contains different block sections, and each block section contains one or more page elements such as text and/or images.
To change or customize content on the block, click the block element from the left side panel to open up its property settings.
Depending on the type of block, you can upload an image, and/or edit texts. Click here to learn more about sections and the types of "Block" Sections you can add to your page.