To access the jellyfin movie player the main thing to know is the URL: video.stovallhut.online. Access the player in your chrome web browser by going to this URL and login with your bitwarden jellyfin credentials.
For iPhone and others see the jellyfin downloads. (on iPhone find Jellyfin Mobile in the app store)
Setup of the client, go to Settings and Add a server. Give it the URL and your bitwarden credentials when prompted (with iphone you can save those credentials and not need to login each time).
I'm seeing on mobile devices ipad/iphone subtitles always playing. Also in the wrong language. Also displayed more than once on the screen and sometimes with overstrikes!
I don't know how to fix this globally for all users but a workaround is as follows:
Login to jellyfin on chrome and click in the upper-right to edit your personal account. Click on subtitles and choose a Subtitle mode of smart. Scroll down and click [Save]. Now when you start a movie on iphone you should not see subtitles by default. (may want to set preferred language to english too).
Note 11/12/2022 I also (or instead of?) on the iPhone go to Settings→Use Native Video Player otherwise I see double subtitles.