Here are the steps to reset password via blackberry device..Hope this helps!
An email account password change via BlackBerry Internet Service should only be performed if the password was entered incorrectly or has been recently changed.
I have a similar problem. I had to change my email password. Now my blackberry is not receiving emails. I am to update the password. I tried the steps outlined. Problem is Verizon set up my email so I don't know what the User Name and Password are in order to reset it. The Existing Users Section does not contain a User name or password. I'm stuck. How do I find the user name and password?