If you want to find the 3 word address for your current location or a location very near you, then you can tap on the "current location" button - the white arrow on the website, and the compass symbol on the app. Or to find the 3 word address for another location altogether, you can search for a street address.
In both cases, you can then zoom to see the 3mx3m grid and move the map and pin to find the exact location and take the 3 words from there. Switching to satellite view helps when you are zoomed in.
Once you've got your 3 words, you can share them or get directions using your favourite navigation service.