You likely won’t be able to. Most Lemmy apps are currently incompatible with Kbin, because Kbin is technically not Lemmy; it’s its own thing, which happens to be largely compatible with Lemmy. Because of that, it doesn’t work exactly the same, and requires special development to function in apps.

Kbin also doesn’t have an API yet. Artemis, a Kbin app currently in development, is having to use a data scraping method at the moment due to the lack of an API, though that will be corrected once an API is available.