The first thing you need to do is to download one of the supported authenticator apps for your smartphone:
1) Open the Desktop.com app
2) Navigate to Workspace settings menu: tap your Workspace name-> Workspace settings, or tap Settings button on the left-side panel
3) Alternatively, click your Profile icon and then navigate to Preferences in the drop-down menu
4) Click Toggle button next to Multi-Factor Authentication to start setting up MFA for your account
5) Scan the shown QR Code in the opened window using your preferred authenticator app and then enter the provided one-time code below. Tap Continue button
6) In the opened window, copy provided recovery code and keep it somewhere safe. You may use it if you need to log in without your device. Select "I have safely recorded this number" checkbox and then click Continue button
7) Enter the one-time code from the authentication app. If you do not want to enter a code each time when you log in with your device, select checkbox Remember this device for 30 days. Click Continue button when you are ready.
8) If you want to disable MFA for your account, just go to the Settings menu again and switch off the toggle button next to Multi-Factor Authentication