Stuttering motion/ add infuse?

I’ve got Vidi on my Apple TV 4K, set up using the quick start guide. I’m having frame rate issues where motion stutters.

I tried swapping to Infuse as the media player but then nothing would play. I’m guessing because I don’t have an account or didn’t install infuse as an add on or something?

How do I add Infuse? And will that fix the motion issues?