To create an infobox, switch to the infobox tab found on the right panel.
Click Create Infobox to add an infobox to the selected layer.

Click the + button on the displayed infobox to add a block to the infobox.

Please select the appropriate content format from the following:
Text: Text-based block
Image: Image-based block
Video: Video-based block
Location: Map-based block
Table: Table-based block