How to add layer to web app builder

Question

https://doc.arcgis.com/en/web-appbuilder/create-apps/themes-tab.htm
https://doc.arcgis.com/en/web-appbuilder/create-apps/map-tab.htm
https://doc.arcgis.com/en/web-appbuilder/create-apps/widgets-tab.htm
https://doc.arcgis.com/en/web-appbuilder/create-apps/widget-overview.htm

 

Zoning Web Map

https://laquinta.maps.arcgis.com/apps/webappviewer/index.html?id=82bcc9df4a1b438b857994ec49ca9c57