a way tagged as building by yourself:
https://www.openstreetmap.org/way/1112079052

a way without any tags:
https://www.openstreetmap.org/way/1372491083

just open the changeset , click the edit button and add the missing tags

or follow this link to do so

https://www.openstreetmap.org/edit?editor=id&changeset=164224209#map=17/-17.355752/37.271540
