bad displaying

Where should the 2 boxes be?

both of them should be under the submit button

Do you have a section in the dashboard to make CSS modifications other than the theme’s files?

Yes,
In the left sidebar of my dashboard, I have a link called “modify CSS” under the menu “Appearance”.

Add this to it;

#respond .form-submit {
 float: none;
}

It worked,

Thank you very much dear Andrew Nevins.
I am really happy with your quick and helpful assistance here.
My best regards to you and all WP.org team.