On the website, click on the three dots next to the 3 word address. A side panel will open, and you then select the 'Share' button, then 'customise your share settings here'. You can then select 'Longitude & Latitude', and then the format you wish to share.
On the app, go to Settings (the icon bottom right), then Share Settings. Select 'Latitude & Longitude', and the format you want to use. Then when you tap the 'share' button for any 3 word address, you can see it in coordinates - perhaps just copy to a notepad app if you don't want to actually send it to someone.