Issues with adjusting GPIB Bus Timing

Hi Everyone

I want to change my GPIB bus timing and HS-488 cable length  but I have issues doing so in NI-MAX using windows 7 64bit.

I think this is due to administrator access rights, but all the setting for the GPIB controller are grayed out and I can not adjust them.

I currently have the newest max, visa 14.0, gpib 140.0 and labview 2014  installed.

Does anyone know what priviallges I need to adjust these setting?

Is there any INI file or register setting I can modify to adjust these settings?

Thanks