Can't use second menu

mm link to your site?

I don’t know why but I can’t paste the link. My site is https://www.dzidziulkowo.pl

Where I can see just one menu.
Where did you set the position?
This theme allows you two menus only if you chose the side menu + secondary menu…

Oh. now I understand the idea of this second menu. I have to say that I thought this function would solve problems I have with my added menu. Could you maybe look at my site right now and advise how to make it as it is on Customizr theme main page?