Need to remove the "domain" text from the owa 2013 logon page

Hi

I need to remove the "domain" text from the owa 2013 logon page. I would like to change it to either user name or email address.

I have been able to do this on owa 2010 but can't find how to do this on 2013.

Thanks for any help you can give me.

CRDNIND PCMD ************