Latest version of Visual Composer not able to edit pages.

Hi
when building websites we often use themes that have visual composer ..

lately we needed to update VC because it got a new version and the templates didnt have it.

so i decided to buy a VC licence to be able to update the VC instantly on our pages.
matter i have now is – in boldial, I don’t see a possibility of editing posts or pages one with VC.

my suspect is VC – there is no place i could enter any API data and stuff.

how can i get my page editable again ?