get rif of “additional information” and spring on product page

Hello, Now I gonna fill the wegstore on Laura.hagmeijer.nl. I thought all troubles are behind me. But…not. When I create a new product: there suddenly is the button additional information again. When I copy an old product, it is all well. And when I will use a related product there is very little space between the product image and the text: related products. I inputted the url of this page, but when I write down or import an url, the support forum refuses to make the topic. So I also cannot add a picture, because in that case I have to add the url to my googledrive. Kind regards Hans Hagmeijer