# Collecting Additional Information from Participants at Sign-Up

Need extra information from participants at sign-up — like a health note, national ID number, or kit size? Custom fields let you collect everything your school needs.

## How to add a custom field to a sign-up form

1. Go to *Settings* → *Sign-ups* and click *Edit* next to the form you want to update.
2. Expand the *Client's information* section.
3. Next to *Need another additional field in the form?*, click *Create a new field* and enter its name (for example, ID number).
4. Once saved, find the field in the *Add additional fields to the form* list and click *Add field*.

![Sign-up form editor showing the Client's information section with the Create a new field option](/files/qvoZNpiingRYuEKRMFis)


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# Agent Instructions: Querying This Documentation

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Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://help.activenow.io/en/online-sign-ups/custom-fields-in-sign-up-form.md?ask=<question>
```

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The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.