Hello
I have question, how to remove this box when I add only pictures

Use the correct question type.
[url] www.limesurvey.org/manual/Question_types/en [/url]

I tried all types but I can't use only picture without any thing else

Use the question type "Text display"

where can I find it ?

 

It's certainly a good idea to have a look at the other options there.
Like
Single questions
Arrays
Multiple questions
Masked questions

Joffm

Because you didn't help us by neglecting the questions at the beginning my answer also was short.