How do I add a new vernacular name to a taxon?

To add a vernacular name to a species or taxon with no vernacular names, or to add a name to other popular names already shown, go to the bottom of the taxon page and click on "Add a missing vernacular name." A new window will open where you can choose the language and enter the name.

Please see the video below, where the name "Ferrassa" is added to "Dasyatis pastinaca" in Catalan.