Same problem here. Don’t see where I can insert the API Key.
Works on Firefox.
EDIT: After a couple of reinstalls and reloading chrome, it started to work. It does load the sentences, however with all the words above my WK level. When I enter my API, it stops loading the sentences at all.
EDIT2: OK, it works now, but still sporadically. The issue is somehow related to http vs https, when I change from one to another it suddenly starts working and seem to work for a while, but sometimes stops showing up again, then I change https to http, it starts working and even if I go back to https it will be fine. This is likely related to a similar behaviour I reported for this: /t/External-Definition-Frame-Placer/3849/1