tap/app/views/devise/registrations/new.html.erb

<h2>Sign up</h2>

<%= form_for(resource, as: resource_name, url: registration_path(resource_name)) do |f| %>
  <%= devise_error_messages! %>

  <%= form_text_field f, :nickname %>
  <%= form_text_field f, :name %>
  <%= form_text_field f, :last_name %>

  <%= form_password_field f, :password %>
  <%= form_password_field f, :password_confirmation %>

  <%= f.label :avatar %>
  <%= f.file_field :avatar %>

  <br />
  <%= f.submit "Sign up", class: 'btn btn-primary' %>
<% end %>

<%= render "devise/shared/links" %>