The way of tryout Yahoo!Mail Beta is as followed:
Sign in your Yahoo!Mai,click (Option)
login in (Account Information)
modify (Member Information)
edit (Preferred Contend)
setup the language as “English-United Kingdom”.Saved.
Return to Yahoo!Mail,you will see:
Get the new Yahoo! Mail. Now you can enjoy powerful protection from viruses, phishing, spam, and more. It´s enhanced security that industry experts are praising non-stop
Click”get the new Yahoo!Mail.then click “Try Beta Now”.It is finished.