Trying to find how to edit a group permissions
 

Im trying to change a group to have read write and execute permissions on everything in the system through command prompt, some people told me to edit the /etc/group file but i don't have a file that exists there under that name, but the group does already exist, i just don't know where its located. Anyone have a clue where i can check or what to do ?

Which Linux distro are you using? From a terminal window try the command:
It will bring you into and editor, usually vim, that will open the group file. You can edit it there.

If I've got it right, you want all members of a certain group to have full access to certain directories? If that's the case, then what I'd do is become root and

assign the directories and their contents to the group:
chgrp -R groupname /directory

give read, write, and execute permisions:
chmod -R g+rwx /directory

Read the man pages first: the only guarantee I offer is that you get to keep the pieces if anything breaks.