lost website after adding api key to plug in

I recently had to obtain and api key from wordpress.com so that
I could activate a couple of plug in’s on a self hosting wordpress
blog and now I cannot find my website, receiving a no document found
error when I type the webstie address into my browser window also
cannot log into the user account I set up to obtain my api key. Receiving the same error. Anyone know how to correct this ? thanks