In the editor's «Blocks» tab, press «Add Block» and choose «Image».
Choose the «Layout»: a single image (banner, square or oval) or several images together, as a slideshow, a grid or a mosaic. For a slideshow you choose the direction and whether the images move on their own.
Below, under «Images», you upload the photos one by one and can give each a caption. Drag them by the dots to change the order.
The preview on the right changes as you type. When you are done press «Save»: until you save, visitors see the previous version.
Still stuck?
Terms and definitions live in the glossary; for anything else there’s support.