How do I edit power values for server groups?

I am attempting to change/set power values for server groups, but all that I am capable of working with at this point is this:

Yes, I am a server admin. I am new to this, so I don't understand whether it's my client or a permission that is keeping me from viewing values and is, instead, allowing me only to edit general information. In order to accomplish what I need to do, I need to be able to set values like as follows:
Server Admin
i_client_kick_from_server_power 75
i_client_needed_kick_from_server_power 75
i_client_kick_from_channel_power 75
i_client_needed_kick_from_channel_power 75

Normal
i_client_needed_kick_from_server_power 50
i_client_needed_kick_from_channel_power 50

Guest
i_client_needed_kick_from_server_power 25
i_client_needed_kick_from_channel_power 25

Channel Admin
i_client_kick_from_channel_power 50
i_client_needed_kick_from_channel_power 50

Attached Images

 

How do I edit power values for server groups?