How to prevent an old login appearing?

How to prevent an old login appearing?

Around 1 year ago I changed my Zoho CRM login and password. However when I click www.zoho.com/crm/lp/login.html on my toolbar, the old login appears automatically as a prompt.  This is irritating and time-consuming, as I have to look up my login and password and enter it manually, when the whole login process should be automatic.  How to prevent the old login appearing?