simple form - rails gem Simple_form installation is not working -

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i using rails 4.2.4 , trying use simple_form

right view gives error:

undefined method `simple_form_for' #<#<class:0xbbc2748>:0xbbc1460>

gem list returns list of gems , includes simple_form. installed simple_form typing gem install simple_form

$gem list

returns

simple_form (3.2.1)

i have tried , got this:

rails generate simple_form:install --bootstrap not find generator 'simple_form:install'. maybe meant 'responders:install', 'rspec:install' or 'devise:install' run `rails generate --help` more options.

does know how fix issue?

if installed via gem install didn't add rails application. instead, need add gemfile, @ the documentation.

gemfile:

gem 'simple_form'

then run bundle install , continue installation github page.


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