how to edit multi-page pdf (2.10.18)

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hi all,

i'm the dumbest person in the world.

why is that important?

because that means i only know how to do the easiest things in the world, of which i can't even do that

let me prove it;

using gimp 2.10.18;

i have a multi-page PDF. and i'm trying to edit a page thats NOT the first page

on the right side - lower column - i see all the pages there!!!!!!!!! (my view is set to the default view) (where the first row of buttons are layers/channels/paths)

when i click on any page thats NOT the first page - nothing happens.  i can't see that page in the center section (ya know where you want to make changes). only the first page is in the center section.

this obviously makes me feel like the dumbest person in the world as i can't do the simplest thing

please help 

thanks for reading