EMAIL

I no longer have any services with att I only have a email. My email address ends with sbcglobal.net. Everytime I go to mail.yahoo.com...I put in my eaill address and it sends me to att.man/currentl.com. Or it sends me to the page that shows my wireless ID I used to have or my Digital ID I used to have. Once last week I was able to log in on my ipad to mail.yahoo.com. I was able to sign in and look at my email. So stupide me I figured sine I can get in there (i also reset my pswrd) I should be able to sign in on my laptop..but no!! I am stuck in the cycle and can not get help!! I tried to go into safemode but I could not get access to the internet...for some reason my laptop would not bring up the icon for the wireless. What do I need to do??