I want that some user's can read ONLY Proxy report Lightsquid

[cybermod]

Hi all!! I'm alex and my english is…. is.... i have not words!
Ok, the question: I created a group named "Proxy Log User Read". If you're in this group, in can read the Lightsquid Report....
The problem: how i can give ONLY this permission for this group?

Regards!!!

(i home that you understand me :D )