root/app/views/account/signup.rhtml

<%= error_messages_for :user %>
<% form_for :user do |f| -%>
<p><label for="login">Login</label><br/>
<%= f.text_field :login %></p>

<p><label for="Role">Role</label><br/>
<SELECT name="user[role]" >     
                        <option value="admin">Admin</option>
                        <option value="editor">User - Upload and Download</option>
                        <option value="viewer">User - Download</option>
                </SELECT>
</p>

<p><label for="email">Email</label><br/>
<%= f.text_field :email %></p>

<p><label for="password">Password</label><br/>
<%= f.password_field :password %></p>

<p><label for="password_confirmation">Confirm Password</label><br/>
<%= f.password_field :password_confirmation %></p>

<p><%= submit_tag 'Sign up' %></p>
<% end -%>