Have a look at your infotainment software version to see if its possible first:
Go to: Settings -> System Information (down the bottom)
You'll see something like this:
System information
Hardware: H56
Software:
1664Display unit/control panel hardware: H40
Display unit/control panel software: 3074
Navigation database: 20.7
Media codec: 3.1.4
Radio database: 1.30.12
Then once you have the number highlighted in bold above, consult the fourth column of this table:

If your result says you can't do it, you can't do it and it seems unlikely it will change ever.

If it says you can, then you just need to press a button in the menus

I'll talk about becoming primary user later....