What is the "second"?
Didn't you see this?

But even only changing the server to mine,  green-cobra-426206.hostingersite.com/ , the images doesn't show.

Of course not. You did not upload to a folder "userfiles" on this server.
You uploaded to the "files" folder of the survey.
And now you do not know how to insert.
The best is to use the button of the editor to insert images.
Then the wizard is displayed
 

Click on "Localizar"
 
Here you upload the images into the "images" folder.

Now select one image and here you see the url to enter into your <img src="...
 

Joffm