Oxygen 8 Controller, can't assign knobs Options

[ziggurat]

I have logic audio 6 with n Oxygen 8 midi controller. I am able to assign pan and volumn to the knobs and slider but am unable to assign any of the other parameters for software instruments or plug-ins to the knobs. I think that I might have to set up the environment etc but I don't seem to be able to find anything that might help me solve this issue. I am really new to all of this so any help would be appreciated. Thanks