Hello,
We’re sorry for a delay.
The reason of your problem is you didn’t have url written in Appearance > Menus:
http://gyazo.com/62767ce01037352b2f6ce291b389900e
Please read our documentation attentively:
https://www.8theme.com/demo/docs/royal/index.html#!/3_one_page
Thank you.
Regards,
Eva Kemp.