Is it a plastic spool pin?
I think you would need to unscrew the top cover, lift it off, and then use a screwdriver or similar tool to pop the broken spool pin out of the cover. My dh has done this for me on vintage machines. I think it is more of a puzzle to figure out how to get the cover off of the newer machines; often there are hidden clips. My dh is a whiz at figuring out stuff like that, me -- not so good......