Phone How can I get root acces on MIUI? (SM-N9005)

I have a problem, on my device Galaxy Note 3 (SM-N9005) I have MIUI(4.8.8) installed.
But I am from Germany, so I've got the German version of MIUI.
And today I found out that MIUI has a own "root system", and I have to activate it manually.
But how?
I know from YouTube that MIUI has an app called permissions but my "German MIUI" doesn't own?/have? this app.
So maybe anyone can help me...

And what is correct own or have?
Sorry for my bad English