Unable to access email from home that was set up for me by small business?

Small bs has given me a URL? email address allowing me to be able to read company emails. Tried the http link which sent me to Yahoo; however, I don't know how to input the user name and password given me by the bs owner. I am able to access the e-mail from another company I perform work for...what's missing?
Unable to access email from home that was set up for me by small business?
Yahoo is still having some problems at the moment. Suggested cures range from Update Adobe Flash Player and Javascript to clear IE7 cache, cookies, and browsing history. Different things seem to work for different people. It's causing attachments to not show, 999 errors where it won't let you do a particular action and some people cannot send recieve delete or move mail. It's not just Vista either it's happening to some of us on XP. I have been advised to use this site to view my mail, www.mail2web.com if all else fails go back to classic mail via this link. http://us.mg1.mail.yahoo.com/dc/optout?s... click yes when asked do you want to opt out. Hope this helps.