simple form - Reddit-like site - ruby-on-rails

Question

I completed a search and found this topic that is close, How do I make simple form to use, I'm too new to fully understand
what I was looking at.
The answer was as follows:
Step 1
rails generate simple_form:install --bootstrap (which I did after adding the Gem and running Bundle Install)
Step 2
Told me to add wrappers (not sure if I need to complete this step)
Step 3
modify the simple_form and has this example:
<%= simple_form_for(#contact, url: supplier_contacts_path, html: { class:
'form-horizontal' }) do |f| %>
<div class="form-inputs">
<%= f.input :c_regular,wrapper: :horizontal_input_group do %>
<span class="input-group-addon">$</span>
<%= f.input_field :c_regular, :label => "Regular",class: "form-control" %>
<% end %>
</div>
<% end %>
My code is as follows(views/comments/show.html.erb):
<div id="comments">
<%= render :partial => #link.comments %>
</div>
<%= simple_form_for(#link, html {class: 'form-horizontal' }) do |f| %>
<div class="field">
<%= f.text_area :body, size: "60x12" %>
</div>
<%= f.submit "Add Comment", class: 'btn btn-primary" %>
<% end %>
Here's my partial(views/comments/_comments.html.erb):
<%= div_for(comment) do %>
<div class="comments_wrapper clearfix">
<div class="pull-left">
<p class="lead"><%= comment.body %></p>
<p><small>Submitted <strong><%= time_ago_in_words(comment.created_at) %>
ago</strong> by
<%= comment.user.email %></small></p>
</div>
<div class="btn-group pull-right">
<% if comment.user == current_user %>
<%= link_to 'Destroy', comment, method: :delete, data: { confirm: 'Are you
sure?' }, class: "btn btn-sm btn-default" %>
<% end %>
<% end %>
</div>
<% end %>