Can I please get some help?

[LambTalk]

I do not have a Jellyfin server. I’m just trying to get streamio running on Jellyfin so I can use with my Roku.

I think you've misunderstood what Jellyfin is for.
Jellyfin is a selfhosted media server for serving your own media.

Stremio on the other hand is for streaming media from online sources.
You cannot access Stremio or any of it's streaming sources via the Jellyfin app. There is no relation between the two.