I have a map on geojson.io, with some errors that I need to correct.
It has a feature to edit a polygon's node but it's too tedious and doesn't have "snapping" mode. So I've imported my .geoJSON, .shp, and .topoJSON format files into QGIS.
And QGIS doesn't enable edit mode. Is it possible to do that or am I on the wrong path? If it's possible, how can I do it?