How to disable old Yahoo email address?

Because I have two and I don't use my first one too much. Is there a possible way? Help!

All of a sudden something happened to my yahoo IM. I am being notified in my IM, by sound alerts, when people in my yahoo email address book log on to yahoo. (not yahoo IM) II do not know how to disable this. I went to the address book part of my friends...

Since days ago, the incoming mail to my yahoo account is being forwarded to my job email address. I didn´t activate this feature. In Yahoo email, in order to try disable this, I go to options, then "POP3 and forwarding email" and I get...

I have a couple of people harassing me on my email address so I want to disable it but I don't want to delete the account because somebody could create that account again and then pretend to be me. Is there any way to disable a yahoo email account without...

Apparently when mail is downloaded to a client via pop, the email is deleted from the server. Occasionally I am out of town and need to check my mail on my phone at yahoo. I forward emails to my yahoo account during that time. Now, however, with Yahoo...

My normal mode is to have all email for me sent to my Yahoo address. I have Yahoo forward it to my internet service provider and I download it to my PC using Thunderbird. When on vacation, I disable the downloading and read the messages directly on Yahoo...

When I click a hyperlinked email address in any web surfing, Outlook (which I don't even use for mail) automatically pops up a 'compose message' window. Is there a way to disable that and instead set up so that the hyperlinked email addresses I click...

This is a fairly simple Yahoo type question as in " How do I change my password?" etc. and so on... In my case it is VERY important to me because I am disabled and forming a corporation I can operate (primarily) from home and as my health conditon...