Osmc skin libray

Where can i find my library for my movies and tv shows in the osmc skin

On the main screen, just like with other skins.

You have to add source locations under the video tab before any library will be created

How do I do that?

https://kodi.wiki/view/Adding_video_sources

i know how to do that , i meant i dont know how to enable the movies and tv shows section

See Video library - Official Kodi Wiki.