> ## Documentation Index
> Fetch the complete documentation index at: https://docs.arkata.mt/llms.txt
> Use this file to discover all available pages before exploring further.

# Settings

> Your project prefix, your password and your firm's billing settings.

Open **Settings** from your profile menu at the bottom of the sidebar. It has three sections: **General**, **Security** and **Billing**.

## Change your firm's project prefix

**Partners and Admins only.** Architects can see the prefix but not change it.

Every project's internal reference starts with your firm's prefix, for example `INT-1042`.

1. Go to **Settings > General**.
2. Type a new prefix of two to four capital letters.
3. Click **Save Prefix**.

The new prefix applies to projects you create from now on. Existing references do not change. See [Project references](/projects/references).

## Change your password

Anyone can change their own password.

1. Go to **Settings > Security**.
2. Enter your current password.
3. Enter your new password twice.

Your new password needs at least 12 characters, uppercase and lowercase letters, at least one number, and at least one special character. A strength bar tracks you as you type. Click **Change Password** once every rule is ticked.

<Tip>
  If you have forgotten your password and cannot sign in at all, a Partner or Admin at your firm has to reset it. There is no self-service reset.
</Tip>

## Firm billing settings

**Partners and Admins only.**

Your invoice numbering, VAT rate, payment details and email sending all live in **Settings > Billing**. See [Firm billing settings](/billing/firm-settings).

## Next steps

<CardGroup cols={2}>
  <Card title="Project references" icon="hashtag" href="/projects/references">
    How internal and PA references work.
  </Card>

  <Card title="Firm billing settings" icon="receipt" href="/billing/firm-settings">
    Invoice numbering, VAT and email sending.
  </Card>
</CardGroup>