Hi Lindy_3
Welcome to the forum.
You might want to have a look at the following FAQ which explains where everything is;
www.benefitsandwork.co.uk/guides-for-claimants/faq/forum.
The correct address depends on where you live as it varies across the regions., your option would be to contact DWP or your local Welfare Rights Organisation.
Did you take a copy of your application form before you sent it off:?
Gary