_edit_form.html.erb

<%= form_for(resource, as: resource_name,
             url: registration_path(resource_name), html: { method: :put }) do |f| %>

  <%= render "devise/shared/error_messages", resource: resource %>

  <div class="row">
    <div class="col-12 col-md-6">
      <div class="form-group">
        <%= f.label :first_name %><br/>
        <%= f.text_field :first_name, autofocus: true, class: 'form-control' %>
      </div>
    </div>
    <div class="col-12 col-md-6">
      <div class="form-group">
        <%= f.label :last_name %><br/>
        <%= f.text_field :last_name, class: 'form-control' %>
      </div>
    </div>
  </div>
  <div class="row">
    <div class="col-12 col-md-6">
      <%= f.label :email %>
      <div class="form-group">
        <%= f.email_field :email, autocomplete: 'email', class: 'form-control' %>
      </div>

      <% if devise_mapping.confirmable? && resource.pending_reconfirmation? %>
        <div><%= t('waiting_confirmation_for') %>: <%= resource.unconfirmed_email %></div>
      <% end %>
    </div>
    <div class="col-12 col-md-6">
      <div class="form-group">
        <%= f.label :current_password %>
        <%= f.password_field :current_password, autocomplete: 'current-password', class: 'form-control' %>
      </div>
    </div>
  </div>
  <div class="row">
    <a class="btn btn-link"
       data-toggle="collapse"
       href="#newPassword"
       role="button"
       aria-expanded="false"
       aria-controls="newPassword">
      Set a new password
    </a>
  </div>
  <div class="collapse" id="newPassword">
    <% if @minimum_password_length %>
      <em>(<%= "#{@minimum_password_length} #{t('min_char')}" %>)</em>
    <% end %>
    <div class="row">
      <div class="col-12 col-md-6">
        <div class="form-group">
          <%= f.label :password %> <br/>
          <%= f.password_field :password, autocomplete: "new-password", class: 'form-control' %>
        </div>
      </div>
      <div class="col-12 col-md-6">
        <div class="form-group">
          <%= f.label :password_confirmation %><br/>
          <%= f.password_field :password_confirmation, autocomplete: 'new-password', class: 'form-control' %>
        </div>
      </div>
    </div>
  </div>

  <%= f.submit t('update'), class: 'btn btn-primary btn-block' %>

<% end %>