About the new way to handle security that is asp.net Identity

When I used the old way to configure security for users and roles I could in design start the Web Site Administrator Tool(WAT) and
create user and roles and associate a user to a role without using any code at all which was good.

Question 1:
If I want to do the same in the new security that is asp.net Identity how can I do that ?
My answer: I assume that the best way to create a user is to run the Register page under the Account folder.

Question 2:

If I also want to create some roles is there some code that is ready to use to do that or do I have create this code myself ?
I mean to Create a user I can use Register so I just wonder if there exist some aspx page CreateRole or something similar ?

Question 3:
If I now want to assign role to users how can I do that ?

//Tony