Change Order of rows and boxes / beginners question

Hi everybody, I just started using the page builder. I've been trying to just arrange rows and boxes for two days now. I can't change the order of the rows. In all the tutorials I found on the internet, this is done using drag and drop. Also, I can't move the boxes within a realm. This is also shown in tutorials using drag and drop. Unfortunately, none of this works for me at all.