Domain Name and server issue

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http://serverfault.com – I am new in web hosting. So please help me out. My problem is as follows: one of my friend has approached to a web hosting company to purchase one domain name and create one website for his organisation. That company did that. After that, that company has been closed due to some reason(we don't know the reason). Now neither they are reachable on phone nor responding on the mail. Now My friend wants to do some changes in that website and he told me to do that. Right now we have following details: 1. server control panel link 2. username-Not working 3. password- also not working 4. mail ids w (HowTos)