If you want to add a picture to your registrtion form, you can use upper, lower and title.
Go to the place where you want to add a picture and click on title.
The screen above appears and on the right side, you will find: Insert/ Edit Image.
When you click on Insert/Edit Image, the next screen appears:
Insert the url of the picture at "Image URL" and a description and title. In the rectangle below you can see a preview of your picture.
When you click on insert, you will see in the "edit title text" an example how it looks like.
When you click on save, the picture is added to your form.