I'm not very good at this I got Plex on the Nvidia shield for like 4 days now and I can't even acces

Can someone please help me get started with Plex I don’t know what the hell I’m doing keep saying that my Nvidia Shield Pro is offline I can’t even access the server please help thank you

Have you looked at the related support articles?
https://support.plex.tv/articles/categories/plex-media-server/nvidia-shield/