In Opera, press "Tools", then select "Delete private data". You will see a window where you need to click on the arrow next to the button "Detailed setting". Then click the link "Manage passwords". In the window that appears you will find a list of web sites and accounts to them. You need to click the left mouse button on the e-mail resource. Opens a specific list of names that you used to successfully log in to this resource. You have to select and delete the login email. Click the button named "Remove" which is located in the upper right corner of the window.
In Internet Explorer, open the mail service, a login name, which you will remove. Visit for authorization. You need to double-click with the left mouse button in the field provided to enter the name of the box. A window will appear in which you will see a list of all accounts that you use to login to the server. Select login and then press the Delete key on your keyboard.
In Mozilla Firefox click the menu "Tools" => "Settings". Select "Protection" and find the link "Passwords", then click the button "Saved passwords". You will see a list of web resources and logins that are used for authorization. Find from the list the desired service and select the desired name, click "Remove". If you wish to delete all the logins, just click "Delete all".
In Google Chrome look for the picture of the wrench, it is located at the top right of this browser. If you hover on it with the mouse, you will see the "customize and control Google Chrome". You should click on this button and in the new menu select the "Settings" button. In the tab as "Personal materials" you will find a field called "Password" and click "Manage saved passwords". And in the appeared window in the list of "Saved passwords" you can find a list of websites, usernames and passphrases to them. Now remove the login email, by simply clicking on the cross icon in the right side of the line.