In general, you'd delete the tags associated with the business, but in this case that would leave an untagged node, which should be deleted.  You can do this by clicking the drop down arrow next to "edit on the main website and selecting the "iD (in browser editor)", which ought to be pretty intuitive to select the node, view its tags, delete it, and save the edit.

If you have a deeper interest in this project, I recommend other editors.  I use the downloadable JOSM.  You'll find a list here, starting with iD and JOSM.

https://wiki.openstreetmap.org/wiki/Editors