Tvheadend

Hi there!
First of all, i'm very excited about TVHeadend, it's a wonderful piece of software.
I have it running in a hyper-v virtual machine, with a FRITZ!WLAN Repeater DVB‑C as source.
Everything is running almost as it should. I have only one problem.
I don't understand how streaming profiles are applied.
I basically need 2 profiles: One to send the stream as is, un-altered in my local network, and another one to transcode the stream for the mobile devices.
So far so good, the profiles are created and working!
But i cannot apply them correctly. They should be assigned through the Access Control tab, right?
Then, there are priorities set in the streaming profiles, but i didn't get it. Higher numbers have higher priorities, or lower numbers?
Tried with users and password, with access based on IP / subnet, and so on.
If somebody can explain these in details, that would be perfect!

Cheers!