An example for Rails Admin and devise
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Here's the simple commands for you to setup

bundle install
rake db:migrate
rake db:seed
rails g rails_admin:install
rails s

localhost:3000 (normal webpage)
localhost:3000/admin (admin webpage)

username: [email protected] 
password: changeme

for more info on how to install rails admin - see 10:13
https://www.youtube.com/watch?v=agzm_O-pZFE

reference:
https://github.com/RailsApps/rails-devise
https://github.com/sferik/rails_admin