I subscribed to Yodlee and opened the Bank Management page. There is no blue icon or blue button visible, so there appears to0 be no way to cancel the existing feed. I did try going through the process via the 'Activate bank Feed link. It gave me the security number. I logged on to my Barclays account and keyed the number into into the relevant box. It came up with the error message ‘6012 - It looks like there are no eligible accounts available to proceed with this request’.
I 'phoned them and they referred me back to you, so here I am! The problem looks as if it starts with the missing icon.