Webonary is a server-side application, that is, it is software. It is used with both the Webonary hosting site (https://webonary.org/) and with other hosting services that you can choose.
You do not need to use Pathway.
In this case, use the Upload to Webonary command to send your dictionary data directly from FieldWorks Language Explorer, as configured.
After you have set up a hosting service and configured a web stylesheet in the Pathway Configuration Tool, then a Destination option called Webonary is available in the Set Defaults and Export through Pathway dialog boxes.
In this case, export through Pathway using your web stylesheet and metadata.