about use of this plugin

[daociyiyou]

I am sure i have configured the plugin well,but not know how to use
it
properly.
first: set role using has_role or accept role method.
second:permit or permit? methods is used to check or set role?
I think they are used for checking,if true for a specific role,run
the
codes in the block of the method,if not,redirect to access denied
page,right? If what i think is right,what is has_role? method?

There is not tutorial by google.