How to insert a pic in header?

I’ve tried to insert a pic but there is no option in header.
because I want to repeat the same pic on every page.


You have to insert the header first (it is an attribute of the page style). Then you can insert the pic in the header.

See for example: How do I add a logo at the top of all the pages of my document?.

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From @MAGICALEX answer, answer deleted:

what you mean I have to insert the header first? I click in the header, there is no option to insert pic

From @Hagar_Delest 's comment

If there is no header yet, click the blue popup that should appear when you’re at the top of the page. Then put the cursor inside and either use the toolbar button to add a picture or add it with the menu Insert > Image.