And here's the aspx code. Unfortunatelly somethings use portuguese language so please let me know if you need help with the translation:

<%@ Control language="C#" Inherits="Farbeira.Modules.PasswordUpdate.ViewFarbeiraPasswordUpdate" CodeFile="ViewFarbeiraPasswordUpdate.ascx.cs" AutoEventWireup="true"%>
<%@ Register TagPrefix="dnn" TagName="Audit" Src="~/controls/ModuleAuditControl.ascx" %>
<asp:ValidationSummary ID="ValidationSummary1" runat="server" />

<table>
    <tr>
      <td>Password antiga:</td>
      <td>
          <asp:TextBox ID="txtPasswordAntiga" runat="server"></asp:TextBox>
          <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" Display="None"
              ErrorMessage="Introduza password antiga" ControlToValidate="txtPasswordAntiga"></asp:RequiredFieldValidator></td>
    </tr>
    <tr>
      <td>Password nova:</td>
      <td>
          <asp:TextBox ID="txtPasswordNova1" runat="server"></asp:TextBox>
          <asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server" Display="None"
              ErrorMessage="Introduza nova password" ControlToValidate="txtPasswordNova1"></asp:RequiredFieldValidator>
          <asp:CustomValidator ID="CustomValidator1" runat="server" ControlToValidate="txtPasswordNova1"
              Display="None" ErrorMessage="A password deve conter letras, n&uacute;meros e s&iacute;mbolos"
              OnServerValidate="CustomValidator1_ServerValidate"></asp:CustomValidator></td>
    </tr>
    <tr>
      <td>Confirme password:</td>
      <td>
          <asp:TextBox ID="txtPasswordNova2" runat="server"></asp:TextBox>
          <asp:RequiredFieldValidator ID="RequiredFieldValidator3" runat="server" Display="None"
              ErrorMessage="Confirme nova password" ControlToValidate="txtPasswordNova2"></asp:RequiredFieldValidator>
          <asp:CompareValidator ID="CompareValidator1" runat="server" ControlToCompare="txtPasswordNova1"
              ControlToValidate="txtPasswordNova2" ErrorMessage="A confirma&ccedil&atilde;o e a nova password devem ser iguais" Display="None"></asp:CompareValidator></td>
    </tr>
    <tr>
        <td></td>
        <td>
            <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Actualizar password" /></td>
    </tr>
</table>
<br />
<asp:Label ID="lblSucesso" runat="server" Text="Password alterada com sucesso." Visible="False"></asp:Label>
<asp:Label ID="lblFalhanco" runat="server" Text="A altera&ccedil;&atilde;o da password falhou. Por favor tente novamente mais tarde ou contacte o administrador de sistemas."
    Visible="False"></asp:Label>

Here it is. I hope this helps:

Introduza password antiga
Enter old password

Password nova
new password

A password deve conter letras, números e símbolos
Password must have letters, numbers and symbols

Confirme password
Confirm password

A confirmação e a nova password devem ser iguais
Confirmation and password must match

Actualizar password
Update password

Password alterada com sucesso
Password successfully updated

A alteração da password falhou. Por favor tente novamente mais tarde ou contacte o administrador de sistemas.
Password update failed. Please try again later or contact the system administrator.