Definitely give editing a shot!
You basically need to just drag the node to the new location. The only "hard" part is not dragging other nodes, which isn't too difficult and can be easily undone.

I just added the In-N-Out in this location, and I'd move the library node, but I'm not confident about the exact location. Based on your description, a picture on their Instagram, and aerial imagery I'm guessing the new location is roughly here?
https://osm.org/go/TaAPhxtoA--?m=

If you send the coordinates, I can move it for you, if you'd like.
You can share the location either by adding a note in the correct location or by clicking the "Share" button and selecting "Include marker" to get a hyperlink.
Thanks!