how to add fields to contact us page for product tab step by step

Hi there how do you add fields to the contact us page for nop commerce step by step im new to nop commerce I tried to add a field in ProductContactUs.cshtml but i got a error

Plugins/SevenSpikes.Nop.Plugins.NopQuickTabs/Views/ProductTab/_ProductContactUs.cshtml

the field i added was postaladdress like so

                         <div class="inputs">
                            @Html.LabelFor(model => model.PostalAddress)
                            @Html.TextAreaFor(model => model.PostalAddress, new { @class =
                            "postaladdress", placeholder = T("ContactUs.PostalAddress.Hint") })
                            @Html.RequiredHint()
                            @Html.ValidationMessageFor(model => model.PostalAddress)
                            </div>

Where else should I add the field. Thanks in advance

Hi,

Unfortunately, it is not possible to add new fields to the form. This will require modifications to the QuickTabs plugin and nopCommerce source code which is not possible.