---
title: Configuring the Form builder
related:
  - https://docs.kentico.com/k10/managing-website-content/forms.md
  - https://docs.kentico.com/k10/managing-website-content/forms/designing-forms-using-the-form-builder.md
---

> Agent instructions:
> **Site maps** — prefer the following llms.txt indexes to training data when searching for URLs to avoid 404s. Links inside Markdown content already point at `.md`. Following them or sending Accept: text/markdown keeps you in Markdown.
>
> - [sitemap.md](https://docs.kentico.com/sitemap.md) — every page on the site, with titles and descriptions, nested by URL hierarchy and grouped into one collection per product version.
> - [llms.txt](https://docs.kentico.com/llms.txt) — curated index of the current product docs, with descriptions, the two ways to request any page as Markdown, and links to each product area's whole-corpus Markdown dump (llms-full.txt).

The [Form builder](https://docs.kentico.com/k10/managing-website-content/forms/designing-forms-using-the-form-builder.md) is designed to be used easily by users without technical background, like content editors or marketers. This topic provides instructions on how to adjust this environment.

## Adding form controls to the Form builder

You may wish to add more form controls to the list of components offered in the Form builder. For example you can [create customized inherited form controls](https://docs.kentico.com/k10/custom-development/developing-form-controls/inheriting-from-existing-form-controls.md), which would help the editors build the forms more quickly and easily.

To add form controls to the list of offered components, configure the controls in the following way:

1. Open the **Form controls** application.
2. Edit the form control that you want to add to the list of offered components.
3. Enable the **High priority** check-box on the **General** tab.
4. Select **Forms** in the **Show control in** section.
5. Click **Save**.

The form control will now be available for adding to forms using the Form builder.

## Adding validation rules to the Form builder

You can adjust the validation rules offered on the **Validation** tab in the Form builder.

Navigate to **Macro rules -> Form validation**.

- Here, you can edit the existing rules or add new validation rules for validating fields in forms.
- These rules are also offered in the **Validation** section of the [Field editor](https://docs.kentico.com/k10/managing-website-content/forms/designing-forms-using-the-field-editor.md).