how to replace one fuse slot on 1998 Buick Century

i have one fuse slot that have no power, checked with test light
how do i replace that wire or do i have another way to get this to work ? do i have to pull fuse box and if so, how do i do that

Asked by for the 1998 Buick Century
Is this a spot that is normally supposed to have power , under the conditions you're testing it? Is it supposed to be constant , key-on(switched) or relay controlled?
not sure if is relay controlled, how do i tell the difference between constant or relay controlled ?