Cleo requires you to log in via the 'membership number' route of Barclay's online banking.
Your Membership number was given to you when you set up online banking. Your Membership number is sent to the email you used to sign up. Do a search for Barclays Membership number in your inbox and you may find it there.
If you still can't find it, you can retrieve it online by clicking here and following the steps. You'll be asked a few security questions, and your Membership number will then be displayed on screen.
Your passcode and memorable word can be set from your online banking. If you click on the drop-down below your name in the top right hand corner of the screen you will see an option to set your memorable word and passcode.