Yahoo email help...

For the last 2 days I have not been able to get to my email messages. Each time I try ,I get the certificate isn't for this website..

"The security certificate presented by this website was issued for a different website's address."
 I have tried signing out of yahoo and back in and few other different thingsYahoo suggested  and still no luck in signing in.  Since it is through Verizon it sent me here , which I am really getting frustrated with the DSL  but can't afford anything else. Any help would be appreciated.