Once the limit exists, you may already have transactions which it should apply to.  Find the transactions one at a time via the Import Transaction List. On the left side, find    

The existing limit (if any) is shown along with a dropdown of all the possible limits.  Choose the right one and Submit. To remove a limit totally, choose the option at the top of the dropdown list, “Select Limit” and Submit. 

If added correctly, on the transaction the limit name should now be shown.