Screwed up Domain Mapping Now How do I get rid of it?

I added the Domain Mapping plug-in may have not installed properly, anyways I tried to map a domain and essentially screwed it up, where now I can't access the website or the domain etc..

I even deleted Domain Mapping but It still will not let me access the site under my admin network (multi-site)

The website is ...
ported domain is kleinmanlawaz

I want to reset it all and get rid of the domain mapping altogether and re-install properly and give it a go again..

How do I do this in the Backend?