Driving me mad!

im not getting this “adding a button ” you speak of but i do see two home buttons

the theme your using obviously uses a preconfigured homepage that you can customise but you have also created a homepage yourself

if you intend to keep the theme homepage just unassign the homepage you made by going to admin / appearance / menus then delete the “home” you see in the menu tree , this will then leave you with the preconfigured hompage

i am assuming this is the problem your trying to explain