Where do i config my plugins from different websites ?

In the description it is stated that: Supports a wide range of plugin sites: uMod, Codefling, Lone.Design, Chaos Code, RustWorkshop, Github, ModPulse, RustPlugins, ImperialPlugins, MyVector, SkyPlugins, Game4Freak.

But would it not need my details to log in and get the updates automagically like Umod ?

Umod allows downloads directly from the URL, such as https://umod.org/plugins/BetterLoot.cs will download Better Loot

For the rest of the plugins, it will randomly choose the first result / marketplace to showcase. If you want to manually override this, view the overrides.json file in the configs folder.

Changed Status from Pending to Not a Bug

Yea but it can not update them correct ? i have to download and upload it myself ?

You still have to download other marketplace plugins and upload them into the thread yes