How to change user authentication Type in Liferay ?

 How to change user Authentication/ login Type in Liferay? If i want to use screen name instead of emailAddress

There  are two ways to change login type in liferay

1)

company.security.auth.type=emailAddress
#company.security.auth.type=screenName
#company.security.auth.type=userId

In the above case , screenName and userId are commented out using #

2)
a)Login as Admin
b)go to Control panel
c)Click on the Portal setting in the left panel under portal tab
d)Click on the Authentication link in the right panel
e)Select the desired login type from the drop down(How do users authenticate? ) under the General tab.