Need help Channels DVR with Docker Manager on TerraMaster F2-424

Need help (detailed) installing and setting up Channels DVR with Docker Manager available on my TerraMaster F2-424 running TOS 5.
Never used a docker engine nor Channels DVR before.

Hi, not sure about Terramaster's Docker Manager but have you looked at the Channels How-to for Docker?
I took the docker-compose and tweaked it for my environment and works well.
Not sure about hardware transcoding (/dev/dri), you might need to to a bit of digging if that's needed, although a quick search pointed me to someone who's done something similar with Plex.
Hope that helps.