**When running JOSM in a Linux VM**
* Go to Edit -> Preferences (or press F12), switch to the keyboard tab (7th from the top) and enter "delete" in the "Search" field.
* Select "Edit: Delete" and choose "Backspace" in the "Key" dropdown (usually near the top; you can also sequentially type "backs..." to jump to the correct entry).
* Click "OK"
![JOSM preferences on Linux][1]
**When running JOSM directly in MacOS**
* Go to Main -> Preferences (or press command + ,), switch to the keyboard tab (at the time of this writing, the tiny icons on the left - 7th from the top) and enter "delete" in the "Search" field.
* Select "Edit: Delete" and choose the arrow-like object that points to the left with an X on it in the "Key" dropdown (usually near the top; there does not seem to be an easy way to jump to it).
* Click "OK"
![JOSM preferences on MacOS][2]
[1]: https://help.openstreetmap.org/upfiles/josm-delete-linux_.png
[2]: https://help.openstreetmap.org/upfiles/josm-delete-macos.png