Before we start, download Dropbox Authenticator App.

When logged into your Dropbox account, click on your account icon at the top right of the screen. Then, from the drop-down menu click on Settings.

Under the Security section click the toggle switch to turn on Two-step verification.

Click on Get started.

Select Use a mobile app and press on Next.

A pop-up window will appear for you to scan the QR Code with Authenticator App. Keep this window open as you reach for your phone.
Note: Do not scan the demo image shown below.

Open Authenticator App and at the bottom of the screen, tap the plus button and hold your device up to the computer screen to scan the QR code. If you are unable to scan the QR code, you can import the QR code in Authenticator from Files, tap the plus sign in Authenticator and choose Files and follow the instructions.

After successfully scanning the QR Code, Authenticator App will automatically choose the Dropbox logo and autofill account name and secret key. If you want you can change the icon or the account name. Press on Save when ready.

Copy the numerical code provided from Authenticator App and confirm it on the Dropbox website and then click Next. Note that this code refreshes every 30 seconds.

You can use a phone number for the backup option, or you can skip this action. When done, press on Next.

Your Dropbox account is now protected with an extra layer of security. You can copy the backup codes into Authenticator or save them in the photo gallery, no matter where you gonna save them, the most important is to store the backup codes in a safe place. Press on Next when ready.

You have successfully enabled two-step verification for your Dropbox account, from now on, you will need to use the Authenticator App when you log in.