1. Sign into the AWS console.

2. Click your username on the top-right side of the console -> Security credentials.

3. Scroll down until you see Multi-factor authentication (MFA) -> click Assign MFA device.

4. Enter the device's name (whatever you want to call it) -> select the Authenticator app option and press Next.

5. Scan the QR code with your MFA app -> enter two consecutive codes -> press Add MFA.

I hope this helped! ^^