Configuration Variable - Edit - Amend

I am trying to edit and amend the configuration variable MS_GUIDGNLIBLIST to reference a personal .dgnlib with a custom tool bar. However, I am unable to modify this variable as all of the options (Add new variable, modify selected variable, etc..) are "grayed out" and non-selectable. Is there a way to have those options selectable? One side note, I am running microstation in a program called "ProjectWise". Thank you. 

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