is there a way to change/reset the email address for my web client (i have cingular)

Are you talking about the BlackBerry email address that you get when you sign up for service? I don't think so if that's what you mean.

^^If thats what you are talking about, you can delete the original BWC account, and then set up a new one if you want....

that is what im talking about -- how do you delete the account? can it be done online or do i have to contact cingular to do so?

I think you may have to call the carrier to accomplish this--make sure they are aware that you want to set up the same device with another BWC account. You may simply be able to dis-associate your current PIN with the current BWC account, but I am not sure about that.