STEP 1: Go to your Cloud Storage (xxxx.Allsync.com or cloud.allsync.com)
STEP 2: Open the menu and click at "Settings"
STEP 3: Navigate to "Security" and Enable "TOTP".
STEP 5: "Generate backup codes"
STEP 6: Safe the codes at an safe place. We recommend to write the code at an paper.
After enable 2-Step Verification you need to generate an password for our Sync software (Desktop, Android, Mac, IOS). Read here how to.