To reset your password of suddenlink email login, go to https://account.suddenlink.net/my-account/forgotpassword.html.
Enter the username.
To get a question for security, enter the button of Get Question.
Enter the answer for security issue.
Choose the options "I'm not a Robot" box to prove you're a real person, not a robot.
Enter the button of next.
See also this post:- https://www.shebuildsbrands.com/forum/forum/how-do-i-access-my-suddenlink-email