I repeat again. Theme doesn’t have separate mobile menu. Add menu to site and mobile menu will be created automatically 

you Can select header type in theme options-header options

menu items can be added in Appearance-navigation 

I just deleted the mobile menu and I want to create a mobile menu from scratch. How can I add the mobile menu again?

if you want me to check your site, you need to provide link first

I add the rehub theme element, save it, and when I click on it, only a semi-transparent black screen appears, the menu does not open, do you understand?

I could not activate the mobile menu, please help me. I tried the method you said, but it did not activate.

As I wrote, it’s created automatically. You can find some option in theme options-mobile options. 

Mobil menü kısmını kendim bu şekilde tasarlayamaz mıyım?

Mobile menu is created automatically based on regular menu. You can deactivate it only by removing menu from site