What you need to do is go near the top of the home page of yahoo.com
and then work your way down the mass of links/options until you get to
where it asks you to sign in.
It will first ask for your username, firstname.lastname@example.org, then hit next and
enter in your password.
Once you login, and start at the beginning of the page, you can hit H
for headings to get to the list of options you can edit, like profile,
mail, and stuff like that. I only messed around enough to change my
password and I did that a while ago so I can't really offer a step by
step guide on how to change your password. I don't use yahoo mail and
only have the account to use yahoo groups.
On 9/26/16, Walmir Schultz via Groups.io