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Yama modeling
The XO Paper Viewfinder, comes in white (the new green)

you need a piece of paper, say 6 cm x 4 cm. Size doesn't matter really.

Fold it in half lengthwise (“hotdog” style)

Cut from the fold to form a frame

which looks sort of like this

Then add a piece of adhesive tape

Trim top and bottom

Then trim so it's narrow, say about 5 mm wide
This is important so the tape doesn't cover the lens

Tape it to the edge of the XO, right by the lens

You can fold in the viewfinder to close the XO

It's paper, you won't damage your screen,
and you won't lose your viewfinder

Open it for use.