1ActiveAdmin.register AdminUser do     
 2  index do                            
 3    column :email                     
 4    column :current_sign_in_at        
 5    column :last_sign_in_at           
 6    column :sign_in_count             
 7    default_actions                   
 8  end                                 
 9
10  filter :email                       
11
12  form do |f|                         
13    f.inputs "Admin Details" do       
14      f.input :email                  
15      f.input :password               
16      f.input :password_confirmation  
17    end                               
18    f.actions                         
19  end                                 
20end