Hello,
If you check your site you’ll see that even when the default theme is enabled nothing works fine:
1) a lot of js errors in the console when you inspect the Dashboard https://gyazo.com/f50f5649014d858ba3b02a070d823011
2) a lot of js errors on the frontend https://gyazo.com/74b5ae9b676cd52aaa63f7622b2199e2
3) page can’t be edited even with the default theme https://gyazo.com/fe64c99a2f644b31b20e8c96a666ef57
We suppose the problem is related to the development version of WordPress that you are using. We are theme support and issues related to default WP installation are out of the scope of our support. Please, install the working version of WordPress first (https://wordpress.org/download/), after that reply me back and we’ll install the latest version of Royal theme.
Regards