Reinstalling Plex

Had to reformat my iMac…
Reinstalled Plex, but unfortunately the wrong way…

Plex doesn’t find my previous libraries and all info related.
A library I worked on for years… :frowning:

I have a back-up from before the reformatting, on an extern HD.

How do I start over / correct my mistake / fix my library ?
Someone got a step bij step guide ?
please?

There is a guide to move Plex which is esentially what you are doing.
Hopefully your backup has enough info.

Thanks!!
But this guide requirers several pre preparation steps which i didnt/couldnt do unfortunately.