Timeless theme … Would like to add menu

Hi
I am admin to Springs Church website. I am working on a section of the site with the timeless theme and would like to add a menu under header .. I have tried to make the menu show and have come to a problem .. it’s not an error though am lost how to fix..
here is the site I am working on with this them
I would like the menu to have links I place in the admin – menu screen .. as I have on the other parts of the site…