I want the user to log in with the ID and password. Real users hate logging in with pin numbers.
you can make a password tab only visible to users who do not have it
(make other tabs invisible unless the user has the password in thier profile)
for your password tab you can just make a text entry
@Glider He is talking about logging into the app with an email address, not access certain tabs. At least, this is what I am assuming.
@taehun Users who sign in with Google or a gmail.com account do not have to repeatedly request a pin to log in. Until there is a password feature as you request, this is one way to work around it. Then you could implement what @Glider suggests if you prefer that type of security.