You've not told us which email service you're trying to access. Is it one provided by your ISP or is it something like Gmail, Outlook or GMX? (i.e. what's the bit after the '@' symbol in your email address). There are hundreds of email providers and they've all got slightly different systems. (It might also help if you can confirm that you're trying to access your email through your web browser, rather than through a dedicated email app. Also, are you using a Windows PC or something like an Android phone?)