How to change the internal links

Hi,
I’m rather new at this. I have some issues building my website with Kalkulat.
First: I want to change the standerd “learn more” to be in Dutch. Don’t know where to fix this.
Second: how can I stop the internal rerouting (like in pushing the “learn more”) to a sort of standard page which I can’t alter or find anywhere in the menu’s. It routs to a standard blog page with a standard slide. Looks awful.
Third: the WPBackery Page Builder (which came with the theme) doesn’t go into fronted editor. Nor does the customizer work.
Forth: why do I have to refresh my live page every time twice before it shows?

Help would be very appreciated