app/views/users/registrations/finish_signup.html.erb
<h2><%= t("omniauth.finish_signup.title") %></h2>
<%= form_for current_user, as: :user, url: do_finish_signup_path, html: { role: "form" } do |f| %>
<%= render "shared/errors", resource: current_user %>
<div class="callout primary">
<%= t("omniauth.finish_signup.username_warning") %>
</div>
<% if current_user.errors.include? :username %>
<%= f.text_field :username %>
<% else %>
<%= f.hidden_field :username %>
<% end %>
<% if current_user.errors.include? :email %>
<%= f.email_field :email %>
<% else %>
<%= f.hidden_field :email %>
<% end %>
<%= f.submit t("devise_views.users.registrations.new.submit"), class: "button expanded" %>
<div class="text-center">
<%= link_to t("devise_views.users.registrations.new.cancel"), destroy_user_session_path, class: "delete", method: :delete %>
</div>
<% end %>