Creating New Pages
Things to note. You can drop pages BEFORE, IN and AFTER other pages. The blue highlighter shows the direction.
Grab pages by their icons, this allows for sorting. Clicking the icon brings up the page's context menu.
Things to note. Dropping around contents works just like droping around pages.
Contents also have icons. You can delete contents via their icons.
Don't forget to save after text editing!
Creating a Gallery
Thing to note. Images in a gallery can be handled just like pages and text elements.
You can use their icons as handles to grab and move them or open their context menu.
To upload files, like images into a gallery, drag them over the page from a folder on your computer, and drop them as usually: before or after an image, or in the gallery, should it be empty.
Note the difference between embedding an image into a formatted text and uploading an image into a gallery. When embedding it in a text, the page is in editing mode (Edit tab open). In that case, you will need to save the page. When uploading the image in the gallery, it's a file operation, not text editing, so there is no need to save anything.
When you select different text elements in editing mode (Edit tab open on toolbar), you will notice the tools on the toolbar's Edit tab become active or inactive. When they are active, the text you have selected allows formatting.
You can embed images in those text fields by a simple drag&drop from your desktop. Remember, this is a text editing feature, you will need to hit Save to make your changes permanent!