> For the complete documentation index, see [llms.txt](https://docs.senpiper.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.senpiper.com/general-system-settings/enable-sign-up/build-a-sign-up-form.md).

# Build a Sign-up form

System Admin can add fields to the sign-up form builder by dragging & dropping them on the workspace. The drag & drop functionality works similarly to [<mark style="color:purple;">**adding a field to the form builder**</mark>](/form-builder/creating-forms/adding-fields-and-saving-a-form.md).

Also, system admins can add only the [<mark style="color:purple;">**basic fields**</mark>](/form-builder/creating-forms/adding-fields-and-saving-a-form/building-forms.md#basic-fields) on the sign-up form.&#x20;

<figure><img src="/files/UYyXTFou7WPh32IAV7OA" alt=""><figcaption><p>Sign-up builder</p></figcaption></figure>

{% hint style="info" %}
'<mark style="color:green;">Name</mark>', '<mark style="color:green;">Email</mark>' & '<mark style="color:green;">Phone number</mark>' fields for a sign-up form are mandatory and are pre-added. Users may not be able to delete the same but can modify a few settings.
{% endhint %}

### 1. Email Field

The System Admin can modify the settings for the pre-added email field in the sign-up form builder.

<figure><img src="/files/zloqs0zPbkLbsjGV0sGS" alt=""><figcaption><p>Email setting for pre-added Email field</p></figcaption></figure>

### 2. Phone Number Field

The System Admin can modify the settings for the pre-added phone number  field in the sign-up form builder.

<figure><img src="/files/vKf41xGys3b4JzOxoOd2" alt=""><figcaption><p>Phone Number Setting for Pre-added field</p></figcaption></figure>

{% hint style="warning" %}
System Admin won't be able to add [<mark style="color:red;">**Section Field**</mark>](/form-builder/creating-forms/adding-fields-and-saving-a-form/individual-field-settings.md#section) to the sign-up form builder&#x20;
{% endhint %}