> For the complete documentation index, see [llms.txt](https://docs.exads.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.exads.com/general/two-factor-authentication.md).
# Two-Factor Authentication
Add a second verification step to your account, using an authentication app or SMS.
Two-factor authentication (2FA) adds a second check when you sign in, so a stolen password alone is not enough to reach your account. You provide two things: a password (something you know) and a second factor, such as a one-time passcode sent to your phone (something you have).
We recommend enabling 2FA on every Advertiser and Publisher account.
## Before You Begin
* To use an authentication app, install one on your phone first.
* To use SMS, have your phone with you and know your country's dialing prefix.
## Enabling 2FA
1. Click your username in the top right of the screen, then select your username from the menu to open your profile.
2. Scroll to the **Two-Factor Authentication (2FA)** section at the bottom of the page and choose a method:
* **Authentication App**
* **SMS Authentication**
### Setting Up 2FA with an Authentication App
1. Click **Enable** for **Authentication App**, then follow the on-screen instructions.
{% hint style="info" %}
You can use any authentication app.
{% endhint %}
2. Once you enter the code, the 2FA method shows as **Enabled**:
### Setting Up 2FA with SMS
1. Click **Enable** for **SMS Authentication**, then enter your mobile phone number, including the dialing prefix for your country.
2. Click **Next**, then enter the code you receive by SMS.
3. Once you enter the token, your configuration shows as **Enabled**:
## 2FA with Multiple Users
If several people need to sign in to the same account, we recommend the **Authentication App** method. Each user can then access the account with a temporary token.
{% hint style="info" %}
You can have both 2FA methods enabled in your account. However, only one of them is requested at each login. Choose which one with the **Set as primary authentication method** checkbox or the **Set as Default** link.
{% endhint %}
From now on, each login asks for your password and a token — the code from your authentication app, or the one sent to you by SMS.
---
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