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What exactly is "account activity in New York"? An e-mail from New York? Yahoo Mail doesn't reveal the source of activity, merely messages that could have been sent from anywhere on the globe despite their apparent origin.
Are your clocks synchronized? Are you sure your system clock is 100% correct? Check with the U. S. Naval Observatory time base at(###) ###-####
Not to be demeaning, but logging in on a library computer, did you actually type your own user account and password, or did you just inherit the last guy's settings? 100 people a day access their e-mail on a library's PC, and very few ever clear the browser history.
Also, AND VERY CRITICALLY, if you have ever logged in on a library computer and NOT cleared the browser history COMPLETELY, AFTER accessing your e-mail, the next person could EASILY have come along and hacked your account.
If you have successfully logged into your account, change the password ***** and then clear the browser history COMPLETELY.
Did you say you were using Internet Explorer? Click the icon at upper right that looks like a little gear wheel with teeth. Choose Internet Options. Choose the General tab on the next popup menu. Look for Browsing History and choose Delete. Delete the history IMMEDIATELY, then EXIT THE BROWSER.
Don't worry about someone else changing your password ***** top of you. Only one login to Yahoo Mail is permitted to any one account at any time.
What will that do? It will prevent the next person behind you from logging on with your credentials without having to know them. The Internet Explorer browser is so "helpful" that it REMEMBERS YOUR CREDENTIALS without notifying you. Isn't that convenient and secure? Do it NOW rather than saying, "Yeah, I'll remember to do that later after I get my work done." PLEASE DO IT IMMEDIATELY. Thank you.