On a sleepy morning I wanted to install a new container I created, naturally things went wrong and I installed the container as a skin.
I did not check what I did and activated it without hesitating. At this moment all you can see is a container when you put the adress from the site in the browser, it is impossible to access any of the controls.

My question: Is it possible to reset to the default skin manually and how do I resolve this?

Just add this to the end of your url of your site and it will load the default skin for you to use to navigate back to the skin page. Just keep adding it to the end of your urls till you get reset back to the skin you want via the control panel.

?SkinSrc=[G]%2fskins%2fdnn-blue%2fhorizontal+menu+-+full+width