Sorry that I’m not allowed to add images here to show you my problem as a new user.
My problem:
On the edit page, there is a huge space that is not in the preview, and I don’t understand what that is and how can I solve it.
I hope you understand that without screenshots.
You should be able to add images here and I’ve not come across that as a restriction before. You should be able to add an image by simply dragging it here to the edit window on the forum while writing a post.
Is it possible you have set the area inside Blocs to be invisible, so it isn’t appearing when previewed?