如何使用Leaflet编辑加载的geoJson

I'm new to stackoverflow, and indeed to coding, so please forgive any missteps on my part regarding forum etiquette, or any other errors on my part. I am working on a project that should allow users to retrieve polygon data from a database and edit them. at this stage I can retrieve the polygons (stored as geojson) upon a click button on a table, but cannot make them editable. I have scoured stackoverflow and various other sites, but cannot seem to work out where I am going wrong. Any help would be very much appreciated. I'm new to stackoverflow, and indeed to coding,