app/views/admin/auth/passwords/edit.html.erb
<div class="login">
<%= form_for(resource, as: resource_name, url: password_path(resource_name), html: { method: :put }) do |f| %>
<%= devise_error_messages! %>
<%= f.hidden_field :reset_password_token %>
<p>
<%= f.label :password, "New password" %><br />
<%= f.password_field :password %>
</p>
<p>
<%= f.label :password_confirmation, "Confirm new password" %><br />
<%= f.password_field :password_confirmation %>
</p>
<p><%= f.submit "Change my password" %></p>
<% end %>
</div>