[SOLVED] make the "artist" site/template navigable from a smartphone

Hi there!
The menu of the "artist" template on my staging site does not appear from a smartphone but only from the PC. I don't know why.
From a smartphone you should see the button at the top left, like a canvas, from which the site navigation menu should then appear laterally. However, you cannot see this button on front end site, therefore you cannot see the main navigation menu and therefore the site cannot be navigated from a smartphone/iphone. Can you help me solve this issue, please?
Could you please describe to me how to solve that step by step?
Thanks a lot in advance.
Best regards,
Nicola

I've just solved it myself. I did this from the "Astroid" > Header > I set the "mobile menu" item to "menu" and then clicked on "Save" at the top of the Astroid framework. I write it here for the benefit of others too. Thanks, a hug. Have a nice Sunday. 
Ciao
Nicola